Re: PcTech Digest, Vol 5, Issue 206

[qsrvbas@xxxxxxxxxxxx]

Jon Paris wrote:

>    1. Re: PcTech Digest, Vol 5, Issue 205 (Jon Paris)
>
> On 17-Oct-07, at 1:00 PM, Scott Klement wrote:
>
> > I'd say there's about a 97% chance that there's a firewall blocking  
> > port
> > 21, and that's the cause of the problem.
>
> I thought I'd eliminated that as a possibility Scott.
>
> A) I cannot FTP to System A.
>
> B) I can FTP to System B with no problem - so apparently no firewall  
> issue on the the PC side.
>
> C) When I connect via a 5250 session to System B I can then FTP from  
> it to System A with no problem.  Those systems are in completely  
> different locations.
>
> What kind of firewall setup would exhibit this behavior?

Any individual firewall could probably do it. And any two different 
firewalls could be more likely to do it.

At least one question would concern whether or not both _routes_ 
follow the same paths through the (inter)network.

Run traceroute from both System A and B to the target (or vice 
versa) and verify that each intervening hop reports the same. If 
nothing else, it'll help illuminate the issue. I'd expect to see a 
difference in the chain of devices. And if no difference shows up, 
that will also be an important clue.

Tom Liotta