Unable to ssh nodes with global IP

Marko Vojinovic vvmarko at gmail.com
Mon Oct 24 02:18:16 UTC 2011

On Monday 24 October 2011 02:18:39 Ed Greshko wrote:
> On 10/24/2011 02:04 AM, Joe Zeff wrote:
> > On 10/23/2011 02:09 AM, Abu Attar Musharih wrote:
> >> The customer service said that  ssh is not allowed. So, what to do
> >> then? I badly need a server with global IP for experimenting grid
> >> computing.
> > 
> > Configure ssh to use a non-standard port such as 6002.
> FWIW....  If an ISP has gone through the trouble of blocking ports of
> well known services chances are they have also blocked incoming SYN
> packets on higher ports as well.
> Thus my suggestion to use a port of a well known service that is allowed.

Oh, be careful Ed, :-)

I got bashed quite a lot for suggesting a similar thing about openvpn couple 
of threads ago... I learned that the proper, politically correct way to answer 
this is the following: if the ISP decided to block port 22, they probably did 
it for security reasons (and not because someone over there is a moron), and 
it's both illegal and unethical to go behind their backs and create a tunnel 
through their firewall without their consent. The OP should check his contract 
with the ISP, because it might be illegal or against their terms of service to 
use ssh on their network. He might get sued  and end up in jail, for all we 

You wouldn't want to encourage the OP into such bad behavior by giving out 
advice to use an open port outside of its intended purposes, would you now?

Oh, btw, as a piece of preemptive advice --- if you reply to this, don't use 
any strange words like "legitimate" or similar, 'cause someone might pick up a 
dictionary against you... ;-)

P.S. Sorry folks, just couldn't resist... :-D No hard feelings, Ed! :-)

Best, :-)

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