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Subject: Re: Fwd: SSHD not connecting from outside(real) IP
To: cygwin@cygwin.com
References: <568AA766.7010101@gmail.com> <568AD08C.6080204@gmail.com>
From: Oleg Volkov <oleg@unicorn.kiev.ua>
Message-ID: <568B76D6.5@unicorn.kiev.ua>
Date: Tue, 5 Jan 2016 09:55:02 +0200
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04.01.2016 22:05, João Paulo writes:
> Hello all,
> I have a mystery and I need help. I have openssh(Cygwin) installed and
> working just fine in here.
> I can connect normally from any of my machines to the server using local
> IPs. Ex: ssh localhost or ssh 192.168.0.2. BUT, when using my external
> IP(over internet->real IP) it times out.
> I can validate that the service is up and running on
> http://www.canyouseeme.org/ on the port FW I did for this service.
> Port 22 is correctly FW to my SSHD server. On windows, I can only see an
> entry on Security Events(attached) and nothing else after that. (Means
> it is reaching my machine)
> I have tried to reinstall Cygwin, change ports. sshd_config is in
> default, disable firewall, AV. I ran out of ideas......
> I had this working fine on previous window 7, now I am on Windows 10.
> Thanks.

Try to issue the `traceroute' command to your real IP over the Internet 
from a Linux computer and specify packet length 1452. If it fails, then 
maybe a misconfigured router (e.g. CISCO) on the way has a lesser MTU 
set and large packets sent by SSH do not get through. If your Internet 
service provider indeed has this problem, then "MSS FIX 1452" command 
issued on a CISCO router may fix it.

Oleg

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