On Thu, Aug 12, 2021 at 10:56:03AM +0800, Vonfry wrote:
isync is configured with Tunnel "nc -X 5 -x 127.0.0.1:1080 -w 10 -N
imappro.zoho.com 993" but the connection cannot be closed after sync
without setting timeout.

my netcat doesn't know most of the options, so i can't really judge that usage ...

It seems isync does not send EOF or close the process after sync.
it's correct that isync sends LOGOUT and waits for the server to close the connection, as specified for the the IMAP protocol. there would be no harm in isync closing it itself (after receiving the BYE response), but it would be a workaround. it's better you find out what the root cause is (try talking imap with the server itself by using another kind of tunnel and telnet, or something), to see whether the server fails to send EOF or the tunnel just fails to forward it.


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