[volunteergrid2-l] [tahoe-dev] connection timeouts on VG2
Johannes Nix
Johannes.Nix at gmx.net
Mon Mar 26 19:34:25 UTC 2012
Hello Brian,
> I believe this is due to a NAT/router entry timing out on the server's
> side (because I didn't observe this with any of the other servers),
> after which inbound packets on the now-stale TCP connection are
> silently dropped.
> [ ... ]
Great analysis. This is certainly also possible for the cerezal
node as the connection here uses an off-the-shelf DSL / NAT
router. In the last days, I have seen lost SSH connections via the
external address when the connection was idle for an extended time.
Would it be helpful if I send a tcpdump for some period like 20 minutes?
Perhaps this allows to confirm or exclude some of the possibilities.
>
> FIXES: 1: fix NAT/firewall configuration to <begin rant>STOP BLOODY
> SECOND GUESSING TCP<end rant> ahem increase the "idle
Second guessing: for communications, never an effective strategy....
Regards,
Johannes
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