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Re: IMAPS and/or openssl problem



It has been written:

>> Except that if you read the man page for nmap you find....
>>
>> Filtered means that a firewall, filter, or other network obstacle is
>> covering the port and preventing nmap from determining whether the port is open.
>>
>> And
>>
>> [egreshko misty ~]$ telnet 86.43.71.228 993
>> Trying 86.43.71.228...
>>
>> Times out....
>>
>> > 
>> > Nmap finished: 1 IP address (1 host up) scanned in 20.467 seconds
>> > =====================================
>> > 
>> > But "netstat -anp --tcp" does not show anything listening on 993

I forgot to mention....that you should see....

[root f7 ~]# netstat -nap | grep 993
tcp        0      0 :::993                      :::*
LISTEN      3318/dovecot

Or something to that effect.

But, since you said that telnet to port 993 on localhost works it is confusing.

You don't happen to have an DSL router with an embedded firewall giving you
grief do you?

For a test, you can always disable your firewall and check again.  The port
should show as "open" and not "filtered".


>> > =====================================
>> > [tim martha ~]$ sudo netstat -anp --tcp
>> > Active Internet connections (servers and established)
>> > Proto Recv-Q Send-Q Local Address               Foreign Address            
>> > State       PID/Program name
>> > tcp        0      0 127.0.0.1:8000              0.0.0.0:*                  
>> > LISTEN      1745/nasd
>> > tcp        0      0 127.0.0.1:2208              0.0.0.0:*                  
>> > LISTEN      1637/hpiod
>> > tcp        0      0 0.0.0.0:139                 0.0.0.0:*                  
>> > LISTEN      1878/smbd
>> > tcp        0      0 0.0.0.0:631                 0.0.0.0:*                  
>> > LISTEN      1654/cupsd
>> > tcp        0      0 127.0.0.1:25                0.0.0.0:*                  
>> > LISTEN      1714/sendmail: acce
>> > tcp        0      0 0.0.0.0:445                 0.0.0.0:*                  
>> > LISTEN      1878/smbd
>> > tcp        0      0 127.0.0.1:2207              0.0.0.0:*                  
>> > LISTEN      1642/python
>> > tcp        0      0 0.0.0.0:33215               0.0.0.0:*                  
>> > LISTEN      1443/rpc.statd
>> > tcp        0      0 192.168.1.149:34676         86.43.71.228:2001          
>> > ESTABLISHED 3298/ssh
>> > tcp        0      0 :::901                      :::*                       
>> > LISTEN      1680/xinetd
>> > tcp        0      0 :::111                      :::*                       
>> > LISTEN      1422/rpcbind
>> > tcp        0      0 :::22                       :::*                       
>> > LISTEN      1668/sshd
>> > tcp        0      0 :::631                      :::*                       
>> > LISTEN      1654/cupsd
>> > =====================================
>> > 
>> > I can telnet 993 on my server without problem:
>> > =====================================
>> > [tim alfred ~]$ telnet localhost 993
>> > Trying 127.0.0.1...
>> > Connected to localhost.localdomain (127.0.0.1).
>> > Escape character is '^]'.
>> > ^]
>> > telnet> quit
>> > Connection closed.
>> > =====================================
>> > 
>> > And "iptables -L" seems to allow this connection:
>> > =====================================
>> > ...
>> > Chain net2fw (1 references)
>> > target     prot opt source               destination
>> > ACCEPT     0    --  anywhere             anywhere            state
>> > RELATED,ESTABLISHED
>> > ACCEPT     icmp --  anywhere             anywhere            icmp
>> > echo-request
>> > ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:http
>> > ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ssh
>> > ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:https
>> > ACCEPT     tcp  --  anywhere             anywhere            tcp
>> > dpt:appserv-http
>> > ACCEPT     udp  --  anywhere             anywhere            udp
>> > dpt:appserv-http
>> > ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:smtp
>> > ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:imaps
>> > Drop       0    --  anywhere             anywhere
>> > LOG        0    --  anywhere             anywhere            LOG level info
>> > prefix `Shorewall:net2fw:DROP:'
>> > DROP       0    --  anywhere             anywhere
>> > ...
>> > =====================================
>> > 
>> > So my best guess is that there is something wrong
>> > with my dovecot configuration.
>> > I "yum remove"d and "yum install"ed dovecot
>> > (and re-edited dovecot.conf),
>> > but that didn't seem to make any difference.
>> > 
>> >> 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.
>> > 
>> > I'll try these tomorrow.
>> > Thanks very much for your help anyway.
>> > 
>>
>>
>> -- 
>> First Law of Bicycling:
>> 	No matter which way you ride, it's uphill and against the wind.
>>
> I had a problem with my app/web server listening on "::::80" awhile
> back.  I'd try to connect (telnet, browser, etc.) and it'd just sit
> there.  I switched to listen on "0.0.0.0:80" and it all worked like a
> charm.  I'm terribly ignorant on IPv6 so I can't speak to what the root
> problem was, but the work-around did the trick.
> 
> -- *Mark C. Allman, PMP*
> -- Allman Professional Consulting, Inc.
> -- www.allmanpc.com <http://www.allmanpc.com>, 617-947-4263
> 
> 	
> 
> *BusinessMsg* -- the secure, managed, J2EE/AJAX Enterprise IM/IC solution.
> 


-- 
A child of five could understand this!  Fetch me a child of five.


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