diff --git a/td/mtproto/SessionConnection.cpp b/td/mtproto/SessionConnection.cpp
index dedd406fd..4a20035c1 100644
--- a/td/mtproto/SessionConnection.cpp
+++ b/td/mtproto/SessionConnection.cpp
@@ -979,16 +979,14 @@ Status SessionConnection::do_flush() {
 
   TRY_STATUS(raw_connection_->flush(auth_data_->get_auth_key(), *this));
 
-  // check last pong
-  if (last_pong_at_ != 0 && last_pong_at_ + ping_disconnect_delay() < Time::now_cached()) {
+  if (last_pong_at_ + ping_disconnect_delay() < Time::now_cached()) {
     raw_connection_->stats_callback()->on_error();
-    return Status::Error(PSLICE() << "No pong :( " << tag("rtt", rtt()) << tag("delay", ping_disconnect_delay()));
+    return Status::Error(PSLICE() << "Ping timeout of " << ping_disconnect_delay() << " seconds expired");
   }
 
-  // check last pong
-  if (last_read_at_ != 0 && last_read_at_ + read_disconnect_delay() < Time::now_cached()) {
+  if (last_read_at_ + read_disconnect_delay() < Time::now_cached()) {
     raw_connection_->stats_callback()->on_error();
-    return Status::Error("No read :(");
+    return Status::Error(PSLICE() << "Read timeout of " << read_disconnect_delay() << " seconds expired");
   }
 
   return Status::OK();
diff --git a/td/mtproto/SessionConnection.h b/td/mtproto/SessionConnection.h
index 777e0be49..4100427b9 100644
--- a/td/mtproto/SessionConnection.h
+++ b/td/mtproto/SessionConnection.h
@@ -130,7 +130,7 @@ class SessionConnection
     return max(2, static_cast<int>(raw_connection_->rtt_ * 1.5 + 1));
   }
 
-  int32 read_disconnect_delay() {
+  int32 read_disconnect_delay() const {
     return online_flag_ ? rtt() * 7 / 2 : 135;
   }
 
@@ -149,8 +149,8 @@ class SessionConnection
   int http_max_wait() const {
     return 25 * 1000;  // 25s. Longer could be closed by proxy
   }
-  static constexpr int HTTP_MAX_AFTER = 10;              // 0.001s
-  static constexpr int HTTP_MAX_DELAY = 30;              // 0.003s
+  static constexpr int HTTP_MAX_AFTER = 10;              // 0.01s
+  static constexpr int HTTP_MAX_DELAY = 30;              // 0.03s
   static constexpr int TEMP_KEY_TIMEOUT = 60 * 60 * 24;  // one day
 
   vector<Query> to_send_;