diff --git a/td/telegram/net/ConnectionCreator.cpp b/td/telegram/net/ConnectionCreator.cpp
index 0aac4d91..0891a662 100644
--- a/td/telegram/net/ConnectionCreator.cpp
+++ b/td/telegram/net/ConnectionCreator.cpp
@@ -229,8 +229,13 @@ void ConnectionCreator::set_proxy_impl(Proxy proxy, bool from_db) {
     return;
   }
 
+  if (proxy_.type() == Proxy::Type::Mtproto || proxy.type() == Proxy::Type::Mtproto) {
+    G()->mtproto_header().set_proxy(proxy);
+    G()->net_query_dispatcher().update_mtproto_header();
+  }
+
   proxy_ = std::move(proxy);
-  G()->mtproto_header().set_proxy(proxy_);
+
   send_closure(G()->state_manager(), &StateManager::on_proxy, have_proxy);
 
   if (!from_db) {
diff --git a/td/telegram/net/NetQueryDispatcher.cpp b/td/telegram/net/NetQueryDispatcher.cpp
index b1432fa9..dafa65fe 100644
--- a/td/telegram/net/NetQueryDispatcher.cpp
+++ b/td/telegram/net/NetQueryDispatcher.cpp
@@ -221,6 +221,19 @@ void NetQueryDispatcher::update_use_pfs() {
     }
   }
 }
+
+void NetQueryDispatcher::update_mtproto_header() {
+  std::lock_guard<std::mutex> guard(main_dc_id_mutex_);
+  for (size_t i = 1; i < MAX_DC_COUNT; i++) {
+    if (is_dc_inited(narrow_cast<int32>(i))) {
+      send_closure_later(dcs_[i - 1].main_session_, &SessionMultiProxy::update_mtproto_header);
+      send_closure_later(dcs_[i - 1].upload_session_, &SessionMultiProxy::update_mtproto_header);
+      send_closure_later(dcs_[i - 1].download_session_, &SessionMultiProxy::update_mtproto_header);
+      send_closure_later(dcs_[i - 1].download_small_session_, &SessionMultiProxy::update_mtproto_header);
+    }
+  }
+}
+
 void NetQueryDispatcher::update_valid_dc(DcId dc_id) {
   wait_dc_init(dc_id, true);
 }
diff --git a/td/telegram/net/NetQueryDispatcher.h b/td/telegram/net/NetQueryDispatcher.h
index b628d056..6ea3ea04 100644
--- a/td/telegram/net/NetQueryDispatcher.h
+++ b/td/telegram/net/NetQueryDispatcher.h
@@ -45,8 +45,11 @@ class NetQueryDispatcher {
 
   void update_session_count();
   void update_use_pfs();
+  void update_mtproto_header();
+
   void update_valid_dc(DcId dc_id);
-  DcId main_dc_id() {
+
+  DcId main_dc_id() const {
     return DcId::internal(main_dc_id_.load());
   }
 
diff --git a/td/telegram/net/SessionMultiProxy.cpp b/td/telegram/net/SessionMultiProxy.cpp
index 7fe27dd8..3ed434eb 100644
--- a/td/telegram/net/SessionMultiProxy.cpp
+++ b/td/telegram/net/SessionMultiProxy.cpp
@@ -87,6 +87,10 @@ void SessionMultiProxy::update_options(int32 session_count, bool use_pfs) {
   }
 }
 
+void SessionMultiProxy::update_mtproto_header() {
+  init();
+}
+
 void SessionMultiProxy::start_up() {
   init();
 }
diff --git a/td/telegram/net/SessionMultiProxy.h b/td/telegram/net/SessionMultiProxy.h
index e1741e71..c318a22e 100644
--- a/td/telegram/net/SessionMultiProxy.h
+++ b/td/telegram/net/SessionMultiProxy.h
@@ -32,6 +32,7 @@ class SessionMultiProxy : public Actor {
   void update_session_count(int32 session_count);
   void update_use_pfs(bool use_pfs);
   void update_options(int32 session_count, bool use_pfs);
+  void update_mtproto_header();
 
  private:
   size_t pos_ = 0;