[NTLUG:Discuss] Getting out past a firewall easiest

[kbrannen@gte.net]

Kipton Moravec wrote:
> At 10:23 AM 6/5/03, Jack Snodgrass wrote:
> 
...
>> You'll need to design your software so that it can make an
>> outgoing socket connection via different ports. It will have
>> to try them out until it gets a good connection. Don't assume
>> that everyone has port 80 open ( web ) becuase they may make
>> their users use a proxy server and only the proxy server
>> can access port 80 outside of the company. Many companies won't
>> let users send email ( port 25 ) to anything other than the
>> local mail server that can then send mail via port 25.
> 
> 
> We were looking at port 80 as our first try.  Did not think of trying 
> different ports. I figured if port 80 was closed then the rest would be 
> closed also. Thanks for the suggestion. If port 80 was closed, what 
> other ports would you recommend trying?

Over 1024 for sure, :-) I'd probably jump to over 10000.

> 
> Is there a "generic" way to hook up to a Proxy Server or could each one 
> be different?  Where should I go to read up more on dealing with a proxy 
> server?

Conceptually they're all the same, configuration-wise each is probably 
different.  The hard part may be getting the proper values (IP & port), i.e. 
finding the technically knowledgable person at the small company with the 
answer.  Also note that http and https *may* be proxied differently, i.e. 
different IP and/or port, if that affects you.

...

HTH,
Kevin