SIP: Unexpected UDP error: connection reset by peer

[Andy-2639]

Environment

• ejabberd: https://www.process-one.net/downloads/downloads-action.php?file=/20.04/ejabberd-20.04-windows.exe
• OS: Windows 10 1909 Pro x64

Errors from error.log/crash.log

ejabberd.log
error.log
crash.log

Bug description

Crashes in SIP module are logged, see attached log files.

[badlop]

I know almost nothing about SIP, but looking to your ejabberd.log file, it seems a client tries to connect, and ejabberd rejects with response 403 Forbidden. This is repeated several times, and eventually gets econnreset (Connection reset by peer)

[Andy-2639]

A rogue client causing the connection reset is very possible. The server permanently gets SIP requests looking like brute force like attacks:

None of the requests are from clients authorized to use my server. Yes, the server is behind NAT (1:1 port forwarding for 5060). At the time of the PCAP, 91.45.130.22 was the public IPv4 address of the server.

I would expect Ejabberd SIP to handle the econnreset gracefully but not to crash.

[licaon-kter]

Seeing constant connections too on SIP, >1000, not sure what's the point but no crashes nor any significant load.