Port 993 and TimeOut

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Hi,

I keep getting log-entries (caused by dropping this packets) when my Thunderbird is running (sitting in the background waiting for mail).

IN=br-lan OUT=ppp0 SRC=xxxxxxxx DST=xxxxxx LEN=52 TOS=0x00 PREC=0x00 TTL=63 ID=56403 DF PROTO=TCP SPT=49759 DPT=993 WINDOW=65535 RES=0x00 ACK FIN URGP=0

993 is IMAP over SSL.

They happen between 5 and 10 seconds and they come in bulks of 10 to 20 every few minutes.

First I suspected netfilters timeout to close this "stale" tcp-session, but increasing the time-out hasn`t changed anything.

Thunderbird does not complain.

Any ideas what might cause this ?

cu romal
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