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+# 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:
+
+=> https://github.com/chesslablab/chess-server
+
+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 ;)