Blocking an IP address from accessing a Web server

Posted on 2002-03-07
Last Modified: 2010-04-13
I have a dedicated server colocated across town, running IIS 5, SP 2.  I recently have noticed something very unusual in my IIS web logs, and I want to know if it is possible to block an IP address, or a range of IP addresses from accessing files on my server?  If so, how?
Question by:Kapusta
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LVL 12

Accepted Solution

Housenet earned 50 total points
ID: 6849299
-In IIS click the properties of say default website (example)& go to the directory security tab.
-Click on the IP address & domain name restrictions.
-To add single ip to be denied choose "group of computers" and add say Using would include and computer from 200.10.10.x.
LVL 12

Expert Comment

ID: 6849301
I meant to say "would include ANY computer from 200.10.10.x."

Author Comment

ID: 6849598
What if you wanted to block every IP from to ?  What subnet mask would I use?   What if I wanted to block to ?
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Author Comment

ID: 6849602
>> To add single ip to be denied choose "group of computers" and add say <<

Why would I choose "group of computers" if I only want to deny ONE IP?
LVL 12

Expert Comment

ID: 6850620
What if I wanted to block to ?
-That would be mask
"Why would I choose "group of computers" if I only want to deny ONE IP? " You're right, choose single computer.. I forgot about that choice...

Author Comment

ID: 6852337
Any idea if one can bypass the Windows dialog and create an ASCII file containing the IPs that I wish to block? IOW, if I have 200 IPs that I want to block, it sure would be nice if there was a faster way to create the blacklist than to type each IP one by one into the dialog window.

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