Tricky Ethernet

For a long time, I had strange disconnections on the one of my servers.

What's checked:

• Syslog ✓
• Firewall ✓
• Kernel ✓
• Memory ✓
• Router ✓
• ...
• Ethernet socket... disconnected!

Spent about one month to find this reason.

By the way, found lot of bugs sensitive to websocket disconnections:

So my trip was useful at least for one open source project :)

The conclusion

Ethernet wire and it sockets has limited life time.

If you're old admin, do not forget to check some rusty stuff at first ;)