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Re: IMAPS and/or openssl problem



On Thu, 2007-08-30 at 21:09 +0100, Andy Green wrote:
Somebody in the thread at some point said:

>>         telnet <myserver> 993
>> I just get
>>         Trying <server IP address>
>> and nothing further, until I type ctrl-C.

> Check /var/log/messages to see if anything is logged.  The behavior of
> telnet sounds like the behavior of openssl.  It's probably not the

No, he doesn't even get a tcp connection established.  If I telnet to my
IMAP server I see

telnet 192.168.0.xx 993
Trying 192.168.0.xx...
Connected to 192.168.0.xx.
Escape character is '^]'.

I would first confirm that something is still listening on your external
network interface on 993.

Why not tcpdump it over your ssh session to the server while you try to
connect and see what you can see.

Another more exotic workaround would be, on your local machine

ssh root myserver -N -L993:localhost:993

while this runs, 993 (the first number) on your local client box will
magically be an encrypted wormhole to port 993 on myserver.  Try running
that in one terminal session, and temporarily alter kmail to go look at
localhost for IMAP instead of myserver.

-Andy

I'm thinking that you get the "Connected to" message from telnet when the initial connection completes.  You get a "Connection refused" when the firewall blocks the connection.  So telnet is trying, and trying, and trying to connect.  Maybe while trying there's an error occurring that's being logged to /var/log/messages.  You are correct that the connection is never completely established, but it doesn't appear to be blocked either. 

Another (trivial) suggestion: use netstat to be sure there's something listening on port 993.  Is it "0.0.0.0:993" (all interfaces) or "127.0.0.1:993" (just the loopback)?


-- Mark C. Allman, PMP
-- Allman Professional Consulting, Inc.
-- www.allmanpc.com, 617-947-4263
BusinessMsg -- the secure, managed, J2EE/AJAX Enterprise IM/IC solution.

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