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Why can not access the IIS web server from another machine in the same network?

I have two computers in the same domain.  They are all Windows XP professional

Each computer installed IIS web server 5.1, they can ping each other.

Computer A can use the IIS web Server in Computer B.

But Computer B can not use the IIS web server in A. In A, the webserver is up. B can access the web server in A before. But seems after installing MS SQL Server 2005, it does not work. ( not sure if it is because of this, but I can not think of I installed some other software).

Is it because of B block http protocal? how can I check this?

Can you think of anything why this happens?
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1 Solution
You can test the http port by opening an Command prompt and enter the following

telnet 80   (replace the IP with the address of your server)  

If the screen clears, than you are connecting to port 80. To exit enter /GET <enter>  or wait for the timeout.

If you get a failed to connect message, than port 80 is being blocked.



did you try disabling your firewall to see if thats your problem?
adamyAuthor Commented:
Thanks for your reply.

I tried telent, yes, port 80 is blocked.

I disabled the firewall, now it works. but How can I enable my firewall and unblock port 80?

Are you using the Windows firewall in WinXP?   If so, do this.  

Go to your Network Connections and select the interface, and go to properties.
Select the Advanced Tab and click on Settings for Windows Firewall.
On the General tab, make sure the "Don't Allow Exceptions" box is unchecked.
Select the Exceptions Tab and click on Add Port.
Enter a Name (web or http for example)  and 80 for Port.
If you want to restrict who can access this port, Click on Change Scope.
Click OK('s) to finish.




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