[stunnel-users] Stunnel waits for a long time if client does not negotiate SSL

Brian Wilkins bwilkins at gmail.com
Tue Aug 7 21:57:54 CEST 2012

stunnel thinks the pipe is still open until the peer closes it.

Have you tried using the TIMEOUTidle or TIMEOUTbusy option?

On Tue, Aug 7, 2012 at 3:47 PM, Denis Solovyov <elk at elk.ru> wrote:

> Hello,
> I use stunnel 4.53 to provide pop3s for existing pop3 service. I start
> stunnel from xinetd, and then exec pop3 utility from stunnel.
> If a legal pop3s client connects to a server, everything's fine. But if
> I try to do "telnet host 995" with a simple telnet client and then just
> do nothing (or even close telnet client without quitting) stunnel
> process keeps waiting for a very long time (actually maybe forever, I
> just kill it). The last line in log in such case "Service [stunnel]
> accepted connection from xx.xx.xx.xx:xxxx". No stunnel TIMEOUT* options
> have effect in this situation.
> What can I do to avoid such "waiting"?
> Maybe stunnel should have something like "SSL negotiation timeout"?  Or
> is there a way to emulate it? (Analyzing `ps` or `netstat` is a bad idea
> of course.)
> With the best regards,
> Denis Solovyov
> _______________________________________________
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> stunnel-users at stunnel.org
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