AFAIK "webcache" is port 8080, normally used by Glassfish HTTP listener. From
the logs you sent I see ~650 open tcp connections (only) before GF restart.
It's not that big value and IMO should not cause any problems. So, may be
this file descriptors leak is not directly related to network connections.
Try to check file descriptors stats using some utility (like lsof). For
example you can check open file descriptors by PID: $lsof | grep WBR, Alexey.
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