Capturing port traffic

[google_groups3]

Hi all.

This is a bit of a long shot i think but right now i am all out of
ideas, so any help is greatly appreciated!

I have an app that sends information on a specific port. However, te
port is blocked on the firewall so the app won't connect. Changing the
firewall config is not an option, nor is reconfiguring the app.

So, my question is this. Is there a way to develop an app that
captures all this information being sent on the local computer from 1
port, and then via this app send it out of a different port?
Re-channeling it so to speak.

Fingers crossed...
TIA.

 

[Guest]

Hi,

Could you use a web service instead?
http://msdn.microsoft.com/webservices/webservices/default.aspx

Ken

 

[Guest]

Hi,

Never mind that work because you cant reconfigure the app recieving
the data.

Ken

 

[google_groups3]

no but my idea would be to have another app (written in VB) at the
other end to pass on the recieved info to the locally listening ports
on the same computer.

i.e.

machine 1 sending info on port 999
app 1 on machine 1 captures all traffic on port 999 and sends it to
port 80 on machine 2

app 2 on machine 2 receives this info and passes to port 999 on local
machine.

 

[Trammel]

Hi all.

This is a bit of a long shot i think but right now i am all out of
ideas, so any help is greatly appreciated!

I have an app that sends information on a specific port. However, te
port is blocked on the firewall so the app won't connect. Changing the
firewall config is not an option, nor is reconfiguring the app.

So, my question is this. Is there a way to develop an app that
captures all this information being sent on the local computer from 1
port, and then via this app send it out of a different port?
Re-channeling it so to speak.

Can you reconfigure the IP in the software or in the local "hosts" file?

IE: If software connects to blah.domain.com... the set the hosts file to
say summiut like:

127.0.0.1          blah.domain.com

 

[Trammel]

Hi all.

This is a bit of a long shot i think but right now i am all out of
ideas, so any help is greatly appreciated!

I have an app that sends information on a specific port. However, te
port is blocked on the firewall so the app won't connect. Changing the
firewall config is not an option, nor is reconfiguring the app.

So, my question is this. Is there a way to develop an app that
captures all this information being sent on the local computer from 1
port, and then via this app send it out of a different port?
Re-channeling it so to speak.

Can you reconfigure the IP in the software or in the local "hosts" file?

IE: If software connects to blah.domain.com... the set the hosts file to
say summiut like:

127.0.0.1          blah.domain.com

Sorry... the reason I asked the above is that if yu can change the IP then
its fairly easy to do a local bounce to a different port... and then maybe
bounc again bck to normal port on a "home" PC... before sending to the final
server. (I did similar to use IRC from work).

 

[Guest]

Hi,

Take a look at the sockets class.

http://msdn.microsoft.com/library/d...rlrfsystemnetsocketstcplistenerclasstopic.asp

http://msdn.microsoft.com/library/d.../frlrfsystemnetsocketstcpclientclasstopic.asp

Ken

 

[google_groups3]

I believe that I can change the IP that the app sends to, so this might
be an option. How would I do it?

Thanks.

 

[google_groups3]

Let me explain better in case anyone has not understood.

I use Internet explorer. But port 80 is closed on the firewall,
however port xxx is open. So, my app in essence captures all traffic
on port 80 and sends it out on port xxx and also captures all incoming
traffic on port xxx and sends it to port 80 on the localhost. on
another remote network is a server sending info on port 80. my other
app on that machine also captures all traffic on port 80 and resends it
on port xxx to my listening app.

i hope this is clearer because i am reeeaaaalllllyyyyy stuck with this!
virtual beers all round for anyone who can help!

p.s. this is just an example, i am not actually interested in
capturing internet traffic as i know that a proxy could do this.

 

[google_groups3]

Hi Trammel,

This sounds like what I want to do. Can you offer any assistance or
code please?

Thanks a lot.