tclientsocket and proxy ?

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3 total messages Started by Alfred Wed, 26 Oct 2005 18:15

#3203

Author: Alfred
Date: Wed, 26 Oct 2005 18:15

10 lines
1480 bytes

Hello all,
I am writing a program for file transfer over internet with TServerSocket and TClientSocket. It work now but I have problems when the client is in lan with a proxy/firewall (in the office) and use it to block some ports.
I have tried it and it seems that only the port 25 can be used for a connection with my server application (error code 10051 on others ports).
I would like to know :
- port 25 can be used by my application like another port or it is checked by proxy becouse it is for email ?
- how can I modify my program to support proxy ?

Thank you very much for help
Alfred

Re: tclientsocket and proxy ?

#3205

Author: Mark Guerrieri
Date: Wed, 26 Oct 2005 21:54

23 lines
1994 bytes

I think the better idea would be to allow your program to be configured to
use any given port, then the people managing the firewall can decide whether
or not to allow traffic on your port to pass, or they may tell you to use a
specific port...

Mark

"Alfred" <alf@no.spam.not.valied.email> wrote in message
news:435fc7c9$1@newsgroups.borland.com...
>
> Hello all,
> I am writing a program for file transfer over internet with TServerSocket
and TClientSocket. It work now but I have problems when the client is in lan
with a proxy/firewall (in the office) and use it to block some ports.
> I have tried it and it seems that only the port 25 can be used for a
connection with my server application (error code 10051 on others ports).
> I would like to know :
> - port 25 can be used by my application like another port or it is checked
by proxy becouse it is for email ?
> - how can I modify my program to support proxy ?
>
> Thank you very much for help
> Alfred

Re: tclientsocket and proxy ?

#3207

Author: Alfred
Date: Thu, 27 Oct 2005 04:20

16 lines
1543 bytes

Thank you for answare.
My program have the possibility to change the port but the main problem is the proxy i think. I would like to learn how to use it like some network programs does. For example like icq, you can specify proxy setting if your network have it.

Thank you very much for your answare.
Alfred




>I think the better idea would be to allow your program to be configured to
>use any given port, then the people managing the firewall can decide whether
>or not to allow traffic on your port to pass, or they may tell you to use a
>specific port...
>
>Mark

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