yesterday I recognized that git cloneing repositories from my private GitLab instance wasn’t working consistently. My internet connection is fine and I can also visit GitLab’s web interface without any problems. I then checked the network packets via Wireshark and encountered some strange behaviour:
- Approx. 70% of all HTTPS requests are just passing fine
- The other 30% get timeouts and I see
[TCP Retransmission] [TCP Port numbers reused]notifications when the timeout occurs - I used another server outside of my home network to check whether the problems occurs from other networks as well. It works fine all the time
- I also get the same problems when I check the HTTPS connection via termux on my mobile device which is not connected to my home network but to the same provider via 4G
- When I use the browser instead of
curl,gitorpythonI get no timeouts at all - ICMP packets are passing fine
- When a timeout occurs, my server’s firewall doesn’t receive any packets. That is another hint on my server being fine
I first thought of faulty network hardware but I am sure that’s not the problem due to the problem occuring on my mobile device via 4G as well.
The only thing I can imagine is that some device of my provider is faulty. My connection uses a dualstack-lite tunnel.
I’d be happy if someone has ideas…
Kind regards from Germany
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