diff --git a/packages/core/src/network/mtproto-session.ts b/packages/core/src/network/mtproto-session.ts
index 9f9b0be8..93adf044 100644
--- a/packages/core/src/network/mtproto-session.ts
+++ b/packages/core/src/network/mtproto-session.ts
@@ -170,6 +170,7 @@ export class MtprotoSession {
     }
 
     updateTimeOffset(offset: number) {
+        this.log.debug('time offset updated: %d', offset)
         this._timeOffset = offset
         // lastMessageId was generated with (potentially) wrong time
         // reset it to avoid bigger issues - at worst, we'll get bad_msg_notification
@@ -243,7 +244,7 @@ export class MtprotoSession {
 
         let messageId = new Long((timeMSec << 21) | (random << 3) | 4, timeSec)
 
-        if (this._lastMessageId.gt(messageId)) {
+        if (this._lastMessageId.ge(messageId)) {
             messageId = this._lastMessageId.add(4)
         }
 
diff --git a/packages/core/src/network/session-connection.ts b/packages/core/src/network/session-connection.ts
index 8421bf7e..27bb18b4 100644
--- a/packages/core/src/network/session-connection.ts
+++ b/packages/core/src/network/session-connection.ts
@@ -954,9 +954,10 @@ export class SessionConnection extends PersistentConnection {
     private _onAllFailed(reason: string) {
         // called when all the pending messages are to be resent
         // e.g. when server returns 429
-
         // most service messages can be omitted as stale
 
+        this.log.debug('all messages failed because of %s', reason)
+
         for (const msgId of this._session.pendingMessages.keys()) {
             const info = this._session.pendingMessages.get(msgId)!
 
@@ -966,6 +967,7 @@ export class SessionConnection extends PersistentConnection {
                 case 'resend':
                 case 'ping':
                     // no longer relevant
+                    this.log.debug('forgetting about %s message %l', info._, msgId)
                     this._session.pendingMessages.delete(msgId)
                     break
                 default:
@@ -1949,10 +1951,12 @@ export class SessionConnection extends PersistentConnection {
             packetSize = writer.pos
 
             const containerId = this._session.getMessageId()
+            const seqNo = this._session.getSeqNo(false)
+            this.log.debug('container: msg_id assigned %l, seqno: %d', containerId, seqNo)
             writer.pos = 0
             rootMsgId = containerId
             writer.long(this._registerOutgoingMsgId(containerId))
-            writer.uint(this._session.getSeqNo(false))
+            writer.uint(seqNo)
             writer.uint(packetSize - 16)
             writer.pos = packetSize