[BlueOnyx:21418] Re: Can't SMPT or SSH

[lewisg at iglou.com]

On Tue, September 26, 2017 14:21, Michael Stauber wrote:
> Hi Lewis,
>
>
>> A 5209R server is on the same /29 subnet as most of the email users who
>>  are behind a router on another IP address. Users on that network can
>> ping and connect to web services but SMTP and SSH connections time out.
>> Outside
>> that subnet everything seems to work OK.
>>
>> I have tried turning off DAR2, Login Manager, AV-SPAM and adding the
>> sublent to the whitelist in Login Manager.
>>
>> I'm at a loss. Any ideas?
>>
>
> I would look at it this way:
>
>
> Login via SSH to one of the boxes from which you cannot access the other
> box. Then check what works:
>
> HTTP connection:
> lynx http://<IP-of-other-box>/
>
> HTTPS connection:
> lynx https://<IP-of-other-box>:443/
>
> SMTP:
> telnet <IP-of-other-box> 25
>
> POP3:
> telnet <IP-of-other-box> 110
>
> SSH:
> ssh -vvv <IP-of-other-box>
>
> See what error messages or additional information you get. The "-vvv" in
> SSH makes the output more verbose and might give some additional pointers.
>
>
> For the other connections: See if you get "connection refused" or
> timeouts, because these point to different underlying causes of the
> problem.
>
> Another thing: If you're using NAT and the servers are in the same
> subnet, then it could be that you have a NAT problem. Like that the
> connection between DMZ servers goes as far as the router, but a
> configurational directive prevents it from going further.

I'm not where I can connect to the network now but I can add some info.

Telnet to port 25 times out.

Yes there is NAT but this quit working after an IP address change from the
cable company. Previously this was all working on a different subnet.

Thanks for the quick reply!