diff --git a/adnl/adnl-ext-client.hpp b/adnl/adnl-ext-client.hpp
index a4df818e..13339725 100644
--- a/adnl/adnl-ext-client.hpp
+++ b/adnl/adnl-ext-client.hpp
@@ -80,6 +80,9 @@ class AdnlExtClientImpl : public AdnlExtClient {
     if (!conn_.empty() && conn_.get() == conn) {
       callback_->on_stop_ready();
       conn_ = {};
+      for (auto& q : out_queries_) {
+        td::actor::send_closure(q.second, &AdnlQuery::set_error, td::Status::Error(ErrorCode::cancelled));
+      }
       alarm_timestamp() = next_create_at_;
       try_stop();
     }
diff --git a/adnl/adnl-query.cpp b/adnl/adnl-query.cpp
index 5bc767d2..e098c134 100644
--- a/adnl/adnl-query.cpp
+++ b/adnl/adnl-query.cpp
@@ -25,13 +25,16 @@ namespace ton {
 namespace adnl {
 
 void AdnlQuery::alarm() {
-  promise_.set_error(td::Status::Error(ErrorCode::timeout, "adnl query timeout"));
-  stop();
+  set_error(td::Status::Error(ErrorCode::timeout, "adnl query timeout"));
 }
 void AdnlQuery::result(td::BufferSlice data) {
   promise_.set_value(std::move(data));
   stop();
 }
+void AdnlQuery::set_error(td::Status error) {
+  promise_.set_error(std::move(error));
+  stop();
+}
 
 AdnlQueryId AdnlQuery::random_query_id() {
   AdnlQueryId q_id;
diff --git a/adnl/adnl-query.h b/adnl/adnl-query.h
index 6e24a49f..3db8c754 100644
--- a/adnl/adnl-query.h
+++ b/adnl/adnl-query.h
@@ -48,6 +48,7 @@ class AdnlQuery : public td::actor::Actor {
   }
   void alarm() override;
   void result(td::BufferSlice data);
+  void set_error(td::Status error);
   void start_up() override {
     alarm_timestamp() = timeout_;
   }
diff --git a/http/http-inbound-connection.cpp b/http/http-inbound-connection.cpp
index 89c9c123..57064ddd 100644
--- a/http/http-inbound-connection.cpp
+++ b/http/http-inbound-connection.cpp
@@ -79,10 +79,10 @@ td::Status HttpInboundConnection::receive(td::ChainBufferReader &input) {
       send_client_error();
       return td::Status::OK();
     }
+    cur_request_ = R.move_as_ok();
     if (exit_loop) {
       return td::Status::OK();
     }
-    cur_request_ = R.move_as_ok();
   }
 
   auto payload = cur_request_->create_empty_payload().move_as_ok();
diff --git a/http/http-outbound-connection.cpp b/http/http-outbound-connection.cpp
index a98efbc9..63621df8 100644
--- a/http/http-outbound-connection.cpp
+++ b/http/http-outbound-connection.cpp
@@ -42,10 +42,10 @@ td::Status HttpOutboundConnection::receive(td::ChainBufferReader &input) {
       answer_error(HttpStatusCode::status_bad_request, "", std::move(promise_));
       return td::Status::OK();
     }
+    cur_response_ = R.move_as_ok();
     if (exit_loop) {
       return td::Status::OK();
     }
-    cur_response_ = R.move_as_ok();
   }
 
   if (cur_response_->code() == 100) {
diff --git a/http/http.cpp b/http/http.cpp
index cefe1a47..dd8ab809 100644
--- a/http/http.cpp
+++ b/http/http.cpp
@@ -279,25 +279,20 @@ td::Status HttpPayload::parse(td::ChainBufferReader &input) {
       } break;
       case ParseState::reading_chunk_data: {
         if (cur_chunk_size_ == 0) {
-          switch (type_) {
-            case PayloadType::pt_empty:
-              UNREACHABLE();
-            case PayloadType::pt_eof:
-            case PayloadType::pt_tunnel:
-              cur_chunk_size_ = 1LL << 60;
-              break;
-            case PayloadType::pt_chunked:
-              state_ = ParseState::reading_crlf;
-              break;
-            case PayloadType::pt_content_length: {
-              LOG(INFO) << "payload parse success";
-              const std::lock_guard<std::mutex> lock{mutex_};
-              state_ = ParseState::completed;
-              run_callbacks();
-              return td::Status::OK();
-            } break;
+          if (type_ == PayloadType::pt_eof || type_ == PayloadType::pt_tunnel) {
+            cur_chunk_size_ = 1LL << 60;
+          } else if (type_ == PayloadType::pt_chunked) {
+            state_ = ParseState::reading_crlf;
+            break;
+          } else if (type_ == PayloadType::pt_content_length) {
+            LOG(INFO) << "payload parse success";
+            const std::lock_guard<std::mutex> lock{mutex_};
+            state_ = ParseState::completed;
+            run_callbacks();
+            return td::Status::OK();
+          } else {
+            UNREACHABLE();
           }
-          break;
         }
         if (input.size() == 0) {
           return td::Status::OK();
@@ -502,7 +497,7 @@ bool HttpPayload::store_http(td::ChainBufferWriter &output, size_t max_size, Htt
       char buf[64];
       ::sprintf(buf, "%lx\r\n", s.size());
       auto slice = td::Slice(buf, strlen(buf));
-      wrote |= !slice.empty();
+      wrote = true;
       output.append(slice);
     }
 
@@ -514,7 +509,8 @@ bool HttpPayload::store_http(td::ChainBufferWriter &output, size_t max_size, Htt
       wrote = true;
     }
   }
-  if (chunks_.size() != 0 || !parse_completed()) {
+  auto cur_state = state_.load(std::memory_order_consume);
+  if (chunks_.size() != 0 || (cur_state != ParseState::reading_trailer && cur_state != ParseState::completed)) {
     return wrote;
   }
   if (!written_zero_chunk_) {
@@ -531,7 +527,7 @@ bool HttpPayload::store_http(td::ChainBufferWriter &output, size_t max_size, Htt
   }
 
   while (max_size > 0) {
-    auto cur_state = state_.load(std::memory_order_consume);
+    cur_state = state_.load(std::memory_order_consume);
     HttpHeader h = get_header();
     if (h.empty()) {
       if (cur_state != ParseState::completed) {
@@ -587,7 +583,8 @@ tl_object_ptr<ton_api::http_payloadPart> HttpPayload::store_tl(size_t max_size)
     max_size -= s.size();
   }
   obj->data_.truncate(obj->data_.size() - S.size());
-  if (chunks_.size() != 0) {
+  auto cur_state = state_.load(std::memory_order_consume);
+  if (chunks_.size() != 0 || (cur_state != ParseState::reading_trailer && cur_state != ParseState::completed)) {
     return obj;
   }
   if (!written_zero_chunk_) {
@@ -597,7 +594,7 @@ tl_object_ptr<ton_api::http_payloadPart> HttpPayload::store_tl(size_t max_size)
   LOG(INFO) << "data completed";
 
   while (max_size > 0) {
-    auto cur_state = state_.load(std::memory_order_consume);
+    cur_state = state_.load(std::memory_order_consume);
     HttpHeader h = get_header();
     if (h.empty()) {
       if (cur_state != ParseState::completed) {
@@ -869,7 +866,7 @@ td::Status HttpHeader::basic_check() {
   }
   for (auto &c : value) {
     if (c == '\r' || c == '\n') {
-      return td::Status::Error("bad character in header name");
+      return td::Status::Error("bad character in header value");
     }
   }
   return td::Status::OK();
diff --git a/rldp-http-proxy/DNSResolver.cpp b/rldp-http-proxy/DNSResolver.cpp
index a7519742..1fb197a5 100644
--- a/rldp-http-proxy/DNSResolver.cpp
+++ b/rldp-http-proxy/DNSResolver.cpp
@@ -25,6 +25,7 @@
 */
 #include "DNSResolver.h"
 #include "td/utils/overloaded.h"
+#include "common/delay.h"
 
 static const double CACHE_TIMEOUT_HARD = 300.0;
 static const double CACHE_TIMEOUT_SOFT = 270.0;
@@ -33,8 +34,18 @@ DNSResolver::DNSResolver(td::actor::ActorId<TonlibClient> tonlib_client) : tonli
 }
 
 void DNSResolver::start_up() {
+  sync();
+}
+
+void DNSResolver::sync() {
   auto obj = tonlib_api::make_object<tonlib_api::sync>();
-  auto P = td::PromiseCreator::lambda([](td::Result<tonlib_api::object_ptr<tonlib_api::Object>>) {});
+  auto P = td::PromiseCreator::lambda([SelfId =
+                                           actor_id(this)](td::Result<tonlib_api::object_ptr<tonlib_api::Object>> R) {
+    if (R.is_error()) {
+      LOG(WARNING) << "Sync error: " << R.move_as_error();
+      ton::delay_action([SelfId]() { td::actor::send_closure(SelfId, &DNSResolver::sync); }, td::Timestamp::in(5.0));
+    }
+  });
   td::actor::send_closure(tonlib_client_, &TonlibClient::send_request, std::move(obj), std::move(P));
 }
 
diff --git a/rldp-http-proxy/DNSResolver.h b/rldp-http-proxy/DNSResolver.h
index f87b5e5a..ba52a67e 100644
--- a/rldp-http-proxy/DNSResolver.h
+++ b/rldp-http-proxy/DNSResolver.h
@@ -37,6 +37,7 @@ class DNSResolver : public td::actor::Actor {
   void resolve(std::string host, td::Promise<ton::adnl::AdnlNodeIdShort> promise);
 
  private:
+  void sync();
   void save_to_cache(std::string host, ton::adnl::AdnlNodeIdShort id);
 
   td::actor::ActorId<TonlibClient> tonlib_client_;
diff --git a/rldp-http-proxy/rldp-http-proxy.cpp b/rldp-http-proxy/rldp-http-proxy.cpp
index a5faa002..a45e6433 100644
--- a/rldp-http-proxy/rldp-http-proxy.cpp
+++ b/rldp-http-proxy/rldp-http-proxy.cpp
@@ -117,7 +117,7 @@ class HttpRemote : public td::actor::Actor {
             }
           });
       td::actor::send_closure(client_, &ton::http::HttpClient::send_request, std::move(request), std::move(payload),
-                              td::Timestamp::in(30.0), std::move(P));
+                              td::Timestamp::never(), std::move(P));
     } else {
       ton::http::answer_error(ton::http::HttpStatusCode::status_bad_request, "", std::move(promise));
     }
@@ -801,6 +801,7 @@ class RldpToTcpRequestSender : public td::actor::Actor {
       , dst_(dst)
       , request_(std::move(request))
       , request_payload_(std::move(request_payload))
+      , proto_version_(request_->proto_version())
       , promise_(std::move(promise))
       , adnl_(adnl)
       , rldp_(rldp)
@@ -824,11 +825,9 @@ class RldpToTcpRequestSender : public td::actor::Actor {
   }
 
   void got_result(std::pair<std::unique_ptr<ton::http::HttpResponse>, std::shared_ptr<ton::http::HttpPayload>> R) {
-    if (R.first->need_payload()) {
-      td::actor::create_actor<HttpRldpPayloadSender>("HttpPayloadSender(R)", std::move(R.second), id_, local_id_, adnl_,
-                                                     rldp_)
-          .release();
-    }
+    td::actor::create_actor<HttpRldpPayloadSender>("HttpPayloadSender(R)", std::move(R.second), id_, local_id_, adnl_,
+                                                   rldp_)
+        .release();
     auto f = ton::serialize_tl_object(R.first->store_tl(), true);
     promise_.set_value(std::move(f));
     stop();
@@ -836,7 +835,7 @@ class RldpToTcpRequestSender : public td::actor::Actor {
 
   void abort_query(td::Status error) {
     LOG(INFO) << "aborting http over rldp query: " << error;
-    promise_.set_result(create_error_response(request_->proto_version(), 502, "Bad Gateway"));
+    promise_.set_result(create_error_response(proto_version_, 502, "Bad Gateway"));
     stop();
   }
 
@@ -848,6 +847,7 @@ class RldpToTcpRequestSender : public td::actor::Actor {
 
   std::unique_ptr<ton::http::HttpRequest> request_;
   std::shared_ptr<ton::http::HttpPayload> request_payload_;
+  std::string proto_version_;
 
   td::Promise<td::BufferSlice> promise_;
 
@@ -1090,6 +1090,7 @@ class RldpHttpProxy : public td::actor::Actor {
     }
 
     rldp_ = ton::rldp::Rldp::create(adnl_.get());
+    td::actor::send_closure(rldp_, &ton::rldp::Rldp::set_default_mtu, 16 << 10);
     td::actor::send_closure(rldp_, &ton::rldp::Rldp::add_id, local_id_);
     for (auto &serv_id : server_ids_) {
       td::actor::send_closure(rldp_, &ton::rldp::Rldp::add_id, serv_id);
diff --git a/rldp/rldp-in.hpp b/rldp/rldp-in.hpp
index b4981999..9640fd98 100644
--- a/rldp/rldp-in.hpp
+++ b/rldp/rldp-in.hpp
@@ -71,7 +71,7 @@ class RldpIn : public RldpImpl {
 
   void send_query(adnl::AdnlNodeIdShort src, adnl::AdnlNodeIdShort dst, std::string name,
                   td::Promise<td::BufferSlice> promise, td::Timestamp timeout, td::BufferSlice data) override {
-    send_query_ex(src, dst, name, std::move(promise), timeout, std::move(data), default_mtu());
+    send_query_ex(src, dst, name, std::move(promise), timeout, std::move(data), default_mtu_);
   }
   void send_query_ex(adnl::AdnlNodeIdShort src, adnl::AdnlNodeIdShort dst, std::string name,
                      td::Promise<td::BufferSlice> promise, td::Timestamp timeout, td::BufferSlice data,
@@ -101,6 +101,10 @@ class RldpIn : public RldpImpl {
   void add_id(adnl::AdnlNodeIdShort local_id) override;
   void get_conn_ip_str(adnl::AdnlNodeIdShort l_id, adnl::AdnlNodeIdShort p_id, td::Promise<td::string> promise) override;
 
+  void set_default_mtu(td::uint64 mtu) override {
+    default_mtu_ = mtu;
+  }
+
   RldpIn(td::actor::ActorId<adnl::AdnlPeerTable> adnl) : adnl_(adnl) {
   }
 
@@ -116,6 +120,7 @@ class RldpIn : public RldpImpl {
   std::set<TransferId> lru_set_;
   RldpLru lru_;
   td::uint32 lru_size_ = 0;
+  td::uint64 default_mtu_ = adnl::Adnl::get_mtu();
 
   std::map<TransferId, td::uint64> max_size_;
 
diff --git a/rldp/rldp.cpp b/rldp/rldp.cpp
index 9b38dcb8..1a772a68 100644
--- a/rldp/rldp.cpp
+++ b/rldp/rldp.cpp
@@ -116,9 +116,9 @@ void RldpIn::process_message_part(adnl::AdnlNodeIdShort source, adnl::AdnlNodeId
     }
     auto ite = max_size_.find(part.transfer_id_);
     if (ite == max_size_.end()) {
-      if (static_cast<td::uint64>(part.total_size_) > default_mtu()) {
+      if (static_cast<td::uint64>(part.total_size_) > default_mtu_) {
         VLOG(RLDP_NOTICE) << "dropping too big rldp packet of size=" << part.total_size_
-                          << " default_mtu=" << default_mtu();
+                          << " default_mtu=" << default_mtu_;
         return;
       }
     } else {
diff --git a/rldp/rldp.h b/rldp/rldp.h
index edb19d7a..b8ce3623 100644
--- a/rldp/rldp.h
+++ b/rldp/rldp.h
@@ -28,15 +28,13 @@ class Rldp : public adnl::AdnlSenderInterface {
  public:
   virtual ~Rldp() = default;
 
-  static constexpr td::uint64 default_mtu() {
-    return adnl::Adnl::get_mtu();
-  }
-
   virtual void add_id(adnl::AdnlNodeIdShort local_id) = 0;
 
   virtual void send_message_ex(adnl::AdnlNodeIdShort src, adnl::AdnlNodeIdShort dst, td::Timestamp timeout,
                                td::BufferSlice data) = 0;
 
+  virtual void set_default_mtu(td::uint64 mtu) = 0;
+
   static td::actor::ActorOwn<Rldp> create(td::actor::ActorId<adnl::Adnl> adnl);
 };
 
diff --git a/tonlib/tonlib/ExtClient.cpp b/tonlib/tonlib/ExtClient.cpp
index 8c8b5d07..30a29b59 100644
--- a/tonlib/tonlib/ExtClient.cpp
+++ b/tonlib/tonlib/ExtClient.cpp
@@ -35,7 +35,7 @@ void ExtClient::with_last_config(td::Promise<LastConfigState> promise) {
       self->last_config_queries_.extract(query_id).set_result(std::move(result));
     });
   };
-  if (client_.last_block_actor_.empty()) {
+  if (client_.last_config_actor_.empty()) {
     return P.set_error(TonlibError::NoLiteServers());
   }
   td::actor::send_closure(client_.last_config_actor_, &LastConfig::get_last_config, std::move(P));
@@ -62,10 +62,10 @@ void ExtClient::send_raw_query(td::BufferSlice query, td::Promise<td::BufferSlic
       self->queries_.extract(query_id).set_result(std::move(result));
     });
   };
-  if (client_.andl_ext_client_.empty()) {
+  if (client_.adnl_ext_client_.empty()) {
     return P.set_error(TonlibError::NoLiteServers());
   }
-  td::actor::send_closure(client_.andl_ext_client_, &ton::adnl::AdnlExtClient::send_query, "query", std::move(query),
+  td::actor::send_closure(client_.adnl_ext_client_, &ton::adnl::AdnlExtClient::send_query, "query", std::move(query),
                           td::Timestamp::in(10.0), std::move(P));
 }
 }  // namespace tonlib
diff --git a/tonlib/tonlib/ExtClient.h b/tonlib/tonlib/ExtClient.h
index 882b4794..707ca74b 100644
--- a/tonlib/tonlib/ExtClient.h
+++ b/tonlib/tonlib/ExtClient.h
@@ -28,6 +28,7 @@
 #include "td/utils/Container.h"
 #include "td/utils/Random.h"
 
+#include "ExtClientLazy.h"
 #include "TonlibError.h"
 #include "utils.h"
 
@@ -37,7 +38,7 @@ class LastConfig;
 struct LastBlockState;
 struct LastConfigState;
 struct ExtClientRef {
-  td::actor::ActorId<ton::adnl::AdnlExtClient> andl_ext_client_;
+  td::actor::ActorId<ExtClientLazy> adnl_ext_client_;
   td::actor::ActorId<LastBlock> last_block_actor_;
   td::actor::ActorId<LastConfig> last_config_actor_;
 };
@@ -94,6 +95,12 @@ class ExtClient {
         });
   }
 
+  void force_change_liteserver() {
+    if (!client_.adnl_ext_client_.empty()) {
+      td::actor::send_closure(client_.adnl_ext_client_, &ExtClientLazy::force_change_liteserver);
+    }
+  }
+
  private:
   ExtClientRef client_;
   td::Container<td::Promise<td::BufferSlice>> queries_;
diff --git a/tonlib/tonlib/ExtClientLazy.cpp b/tonlib/tonlib/ExtClientLazy.cpp
index 1ab7a24f..335a0ff9 100644
--- a/tonlib/tonlib/ExtClientLazy.cpp
+++ b/tonlib/tonlib/ExtClientLazy.cpp
@@ -18,13 +18,20 @@
 */
 #include "ExtClientLazy.h"
 #include "TonlibError.h"
+#include "td/utils/Random.h"
 namespace tonlib {
 
-class ExtClientLazyImp : public ton::adnl::AdnlExtClient {
+class ExtClientLazyImp : public ExtClientLazy {
  public:
-  ExtClientLazyImp(ton::adnl::AdnlNodeIdFull dst, td::IPAddress dst_addr,
+  ExtClientLazyImp(std::vector<std::pair<ton::adnl::AdnlNodeIdFull, td::IPAddress>> servers,
                    td::unique_ptr<ExtClientLazy::Callback> callback)
-      : dst_(std::move(dst)), dst_addr_(std::move(dst_addr)), callback_(std::move(callback)) {
+      : servers_(std::move(servers)), callback_(std::move(callback)) {
+    CHECK(!servers_.empty());
+  }
+
+  void start_up() override {
+    td::Random::Fast rnd;
+    td::random_shuffle(td::as_mutable_span(servers_), rnd);
   }
 
   void check_ready(td::Promise<td::Unit> promise) override {
@@ -41,37 +48,66 @@ class ExtClientLazyImp : public ton::adnl::AdnlExtClient {
     if (client_.empty()) {
       return promise.set_error(TonlibError::Cancelled());
     }
+    td::Promise<td::BufferSlice> P = [SelfId = actor_id(this), idx = cur_server_idx_,
+                                      promise = std::move(promise)](td::Result<td::BufferSlice> R) mutable {
+      if (R.is_error() &&
+          (R.error().code() == ton::ErrorCode::timeout || R.error().code() == ton::ErrorCode::cancelled)) {
+        td::actor::send_closure(SelfId, &ExtClientLazyImp::set_server_bad, idx, true);
+      }
+      promise.set_result(std::move(R));
+    };
     send_closure(client_, &ton::adnl::AdnlExtClient::send_query, std::move(name), std::move(data), timeout,
-                 std::move(promise));
+                 std::move(P));
   }
 
+  void force_change_liteserver() override {
+    if (servers_.size() == 1) {
+      return;
+    }
+    cur_server_bad_ = cur_server_bad_force_ = true;
+  }
+
+ private:
   void before_query() {
     if (is_closing_) {
       return;
     }
-    if (!client_.empty()) {
-      alarm_timestamp() = td::Timestamp::in(MAX_NO_QUERIES_TIMEOUT);
+    alarm_timestamp() = td::Timestamp::in(MAX_NO_QUERIES_TIMEOUT);
+    if (cur_server_bad_) {
+      ++cur_server_idx_;
+    } else if (!client_.empty()) {
       return;
     }
     class Callback : public ton::adnl::AdnlExtClient::Callback {
      public:
-      explicit Callback(td::actor::ActorShared<> parent) : parent_(std::move(parent)) {
+      explicit Callback(td::actor::ActorShared<ExtClientLazyImp> parent, size_t idx)
+          : parent_(std::move(parent)), idx_(idx) {
       }
       void on_ready() override {
+        td::actor::send_closure(parent_, &ExtClientLazyImp::set_server_bad, idx_, false);
       }
       void on_stop_ready() override {
+        td::actor::send_closure(parent_, &ExtClientLazyImp::set_server_bad, idx_, true);
       }
 
      private:
-      td::actor::ActorShared<> parent_;
+      td::actor::ActorShared<ExtClientLazyImp> parent_;
+      size_t idx_;
     };
     ref_cnt_++;
-    client_ = ton::adnl::AdnlExtClient::create(dst_, dst_addr_, std::make_unique<Callback>(td::actor::actor_shared()));
+    cur_server_bad_ = false;
+    cur_server_bad_force_ = false;
+    const auto& s = servers_[cur_server_idx_ % servers_.size()];
+    LOG(INFO) << "Connecting to liteserver " << s.second;
+    client_ = ton::adnl::AdnlExtClient::create(
+        s.first, s.second, std::make_unique<Callback>(td::actor::actor_shared(this), cur_server_idx_));
   }
 
- private:
-  ton::adnl::AdnlNodeIdFull dst_;
-  td::IPAddress dst_addr_;
+  std::vector<std::pair<ton::adnl::AdnlNodeIdFull, td::IPAddress>> servers_;
+  size_t cur_server_idx_ = 0;
+  bool cur_server_bad_ = false;
+  bool cur_server_bad_force_ = false;
+
   td::actor::ActorOwn<ton::adnl::AdnlExtClient> client_;
   td::unique_ptr<ExtClientLazy::Callback> callback_;
   static constexpr double MAX_NO_QUERIES_TIMEOUT = 100;
@@ -79,6 +115,11 @@ class ExtClientLazyImp : public ton::adnl::AdnlExtClient {
   bool is_closing_{false};
   td::uint32 ref_cnt_{1};
 
+  void set_server_bad(size_t idx, bool bad) {
+    if (idx == cur_server_idx_ && servers_.size() > 1 && !cur_server_bad_force_) {
+      cur_server_bad_ = bad;
+    }
+  }
   void alarm() override {
     client_.reset();
   }
@@ -99,9 +140,13 @@ class ExtClientLazyImp : public ton::adnl::AdnlExtClient {
   }
 };
 
-td::actor::ActorOwn<ton::adnl::AdnlExtClient> ExtClientLazy::create(ton::adnl::AdnlNodeIdFull dst,
-                                                                    td::IPAddress dst_addr,
-                                                                    td::unique_ptr<Callback> callback) {
-  return td::actor::create_actor<ExtClientLazyImp>("ExtClientLazy", dst, dst_addr, std::move(callback));
+td::actor::ActorOwn<ExtClientLazy> ExtClientLazy::create(ton::adnl::AdnlNodeIdFull dst, td::IPAddress dst_addr,
+                                                         td::unique_ptr<Callback> callback) {
+  return create({std::make_pair(dst, dst_addr)}, std::move(callback));
+}
+
+td::actor::ActorOwn<ExtClientLazy> ExtClientLazy::create(
+    std::vector<std::pair<ton::adnl::AdnlNodeIdFull, td::IPAddress>> servers, td::unique_ptr<Callback> callback) {
+  return td::actor::create_actor<ExtClientLazyImp>("ExtClientLazy", std::move(servers), std::move(callback));
 }
 }  // namespace tonlib
diff --git a/tonlib/tonlib/ExtClientLazy.h b/tonlib/tonlib/ExtClientLazy.h
index 6014abd3..dc4490b3 100644
--- a/tonlib/tonlib/ExtClientLazy.h
+++ b/tonlib/tonlib/ExtClientLazy.h
@@ -22,15 +22,20 @@
 #include "adnl/adnl-ext-client.h"
 
 namespace tonlib {
-class ExtClientLazy {
+class ExtClientLazy : public ton::adnl::AdnlExtClient {
  public:
   class Callback {
    public:
     virtual ~Callback() {
     }
   };
-  static td::actor::ActorOwn<ton::adnl::AdnlExtClient> create(ton::adnl::AdnlNodeIdFull dst, td::IPAddress dst_addr,
-                                                              td::unique_ptr<Callback> callback);
+
+  virtual void force_change_liteserver() = 0;
+
+  static td::actor::ActorOwn<ExtClientLazy> create(ton::adnl::AdnlNodeIdFull dst, td::IPAddress dst_addr,
+                                                   td::unique_ptr<Callback> callback);
+  static td::actor::ActorOwn<ExtClientLazy> create(
+      std::vector<std::pair<ton::adnl::AdnlNodeIdFull, td::IPAddress>> servers, td::unique_ptr<Callback> callback);
 };
 
 }  // namespace tonlib
diff --git a/tonlib/tonlib/ExtClientOutbound.cpp b/tonlib/tonlib/ExtClientOutbound.cpp
index fcccc4d4..025ba848 100644
--- a/tonlib/tonlib/ExtClientOutbound.cpp
+++ b/tonlib/tonlib/ExtClientOutbound.cpp
@@ -38,6 +38,9 @@ class ExtClientOutboundImp : public ExtClientOutbound {
     callback_->request(query_id, data.as_slice().str());
   }
 
+  void force_change_liteserver() override {
+  }
+
   void on_query_result(td::int64 id, td::Result<td::BufferSlice> r_data, td::Promise<td::Unit> promise) override {
     auto it = queries_.find(id);
     if (it == queries_.end()) {
diff --git a/tonlib/tonlib/ExtClientOutbound.h b/tonlib/tonlib/ExtClientOutbound.h
index 7bab4903..87b73b9e 100644
--- a/tonlib/tonlib/ExtClientOutbound.h
+++ b/tonlib/tonlib/ExtClientOutbound.h
@@ -19,10 +19,10 @@
 #pragma once
 #include "td/actor/actor.h"
 
-#include "adnl/adnl-ext-client.h"
+#include "ExtClientLazy.h"
 
 namespace tonlib {
-class ExtClientOutbound : public ton::adnl::AdnlExtClient {
+class ExtClientOutbound : public ExtClientLazy {
  public:
   class Callback {
    public:
diff --git a/tonlib/tonlib/LastBlock.cpp b/tonlib/tonlib/LastBlock.cpp
index bc2b74ba..10a4d10f 100644
--- a/tonlib/tonlib/LastBlock.cpp
+++ b/tonlib/tonlib/LastBlock.cpp
@@ -374,6 +374,7 @@ void LastBlock::on_sync_error(td::Status status) {
     promise.set_error(status.clone());
   }
   promises_.clear();
+  client_.force_change_liteserver();
 }
 void LastBlock::on_fatal_error(td::Status status) {
   VLOG(last_block) << "sync: fatal error " << status;
diff --git a/tonlib/tonlib/LastConfig.cpp b/tonlib/tonlib/LastConfig.cpp
index 0111095b..960d5994 100644
--- a/tonlib/tonlib/LastConfig.cpp
+++ b/tonlib/tonlib/LastConfig.cpp
@@ -141,6 +141,7 @@ void LastConfig::on_error(td::Status status) {
     promise.set_error(status.clone());
   }
   promises_.clear();
+  get_config_state_ = QueryState::Empty;
 }
 
 void LastConfig::tear_down() {
diff --git a/tonlib/tonlib/TonlibClient.cpp b/tonlib/tonlib/TonlibClient.cpp
index 842ea5fd..f9e984bb 100644
--- a/tonlib/tonlib/TonlibClient.cpp
+++ b/tonlib/tonlib/TonlibClient.cpp
@@ -1649,7 +1649,7 @@ void TonlibClient::hangup() {
 
 ExtClientRef TonlibClient::get_client_ref() {
   ExtClientRef ref;
-  ref.andl_ext_client_ = raw_client_.get();
+  ref.adnl_ext_client_ = raw_client_.get();
   ref.last_block_actor_ = raw_last_block_.get();
   ref.last_config_actor_ = raw_last_config_.get();
 
@@ -1683,10 +1683,10 @@ void TonlibClient::init_ext_client() {
     ext_client_outbound_ = client.get();
     raw_client_ = std::move(client);
   } else {
-    auto lite_clients_size = config_.lite_clients.size();
-    CHECK(lite_clients_size != 0);
-    auto lite_client_id = td::Random::fast(0, td::narrow_cast<int>(lite_clients_size) - 1);
-    auto& lite_client = config_.lite_clients[lite_client_id];
+    std::vector<std::pair<ton::adnl::AdnlNodeIdFull, td::IPAddress>> servers;
+    for (const auto& s : config_.lite_clients) {
+      servers.emplace_back(s.adnl_id, s.address);
+    }
     class Callback : public ExtClientLazy::Callback {
      public:
       explicit Callback(td::actor::ActorShared<> parent) : parent_(std::move(parent)) {
@@ -1697,8 +1697,7 @@ void TonlibClient::init_ext_client() {
     };
     ext_client_outbound_ = {};
     ref_cnt_++;
-    raw_client_ = ExtClientLazy::create(lite_client.adnl_id, lite_client.address,
-                                        td::make_unique<Callback>(td::actor::actor_shared()));
+    raw_client_ = ExtClientLazy::create(std::move(servers), td::make_unique<Callback>(td::actor::actor_shared()));
   }
 }
 
diff --git a/tonlib/tonlib/TonlibClient.h b/tonlib/tonlib/TonlibClient.h
index 800d8c80..e7819290 100644
--- a/tonlib/tonlib/TonlibClient.h
+++ b/tonlib/tonlib/TonlibClient.h
@@ -110,7 +110,7 @@ class TonlibClient : public td::actor::Actor {
   vm::Dictionary libraries{256};
 
   // network
-  td::actor::ActorOwn<ton::adnl::AdnlExtClient> raw_client_;
+  td::actor::ActorOwn<ExtClientLazy> raw_client_;
   td::actor::ActorId<ExtClientOutbound> ext_client_outbound_;
   td::actor::ActorOwn<LastBlock> raw_last_block_;
   td::actor::ActorOwn<LastConfig> raw_last_config_;
diff --git a/tonlib/tonlib/tonlib-cli.cpp b/tonlib/tonlib/tonlib-cli.cpp
index e889234a..0a042eb1 100644
--- a/tonlib/tonlib/tonlib-cli.cpp
+++ b/tonlib/tonlib/tonlib-cli.cpp
@@ -174,7 +174,7 @@ class TonlibCli : public td::actor::Actor {
 
   std::map<std::uint64_t, td::Promise<tonlib_api::object_ptr<tonlib_api::Object>>> query_handlers_;
 
-  td::actor::ActorOwn<ton::adnl::AdnlExtClient> raw_client_;
+  td::actor::ActorOwn<tonlib::ExtClientLazy> raw_client_;
 
   bool is_closing_{false};
   td::uint32 ref_cnt_{1};