Firewall Off: Process On Clients Can't Open Com. With Server

[Dan]

Hello does anybody can help me on the following topic?

-A server 2008 running an application server waiting for a client application communication instanciated remotely on a client Windows XP computer. (comm port number e.g.12345)

Firewall is deactivated on client and server, DHCP is running properly, DNS ok, server application shared directory perfectly shared

Visible and accessible for any client.

-From any client (windows xp) a client application is remotely downloaded from the server shared directory, it starts but stop immediately.

because not allowed (it seems to) to communicante with the server application on port 12345.

The server seems to block incoming communication, even a standard telnet is not allowed while firewall is off.

Note That if the application runs on any Windows XP , it works perfectif it is only a server 2008 problem.

 

Note also that the server was used to work perfectly until a domain was created then removed.

 

Thank you for your help

Dandan

[ICTCity]

two questions:

 

computers and server are on the same network?

On the server side, is the application listening on a port? If yes, if you run a port scan against your server from a client, can you see that port?

 

Anyway, are you sure that all the three types of firewall are disabled? Go to admin tools > firewall with advanced security, there's a private, public and domain profile.

 

Let me know.

[Dan]

two questions:

 

computers and server are on the same network?

On the server side, is the application listening on a port? If yes, if you run a port scan against your server from a client, can you see that port?

 

Anyway, are you sure that all the three types of firewall are disabled? Go to admin tools > firewall with advanced security, there's a private, public and domain profile.

 

Let me know.

[Dan]

Hello,

Yes computers and server are on the same network. On the server side the application is listening on port 12345 (I can check it with a netstat command). I confirm that the three firewalls are off.

 

What type of command can I use to make a port scan against the server from client side ?

Thank You

[ICTCity]

Try this:

 

http://technet.microsoft.com/en-us/sysinternals/bb896645

 

I wrote a tutorial but right now is not online, anyway, is not too hard that program. Look for the column "RESULT" and see if there are any ACCESS DENIED or others.

 

When the tutorial will be back again, I will post the link.

[ICTCity]

Here's the tutorial:

http://freepchelp.forum/topic/1479-use-process-monitor-to-set-up-permissions-properly/