How to block a website from ISA 2006

Even after adding the link for e.g.* in URL Sets - Block Website, the user still can access it. It works for some days and then all of a sudden all of my users can access it and then again it blocks by itself. What could be the reason ?
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TomislavjSystem AdminCommented:
what rule do You have for this url set?
sns-emeaAuthor Commented:
I have a policy called Internet in this policy Action is Allow from Internal to External and under exceptions Block Website (URL) is there.
TomislavjSystem AdminCommented:
why don't You try explicit deny rule for this url set?
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sns-emeaAuthor Commented:
how ?
TomislavjSystem AdminCommented:
open ISA server management then go to "Firewall policy" then:
1. Action->New->Access rule (name thaht rule as You wish)
2. Check radio button "Deny"
3. Choose "All outbound traffic" in drop-down menu
4. Add "Internal network"
5. Add URL set You have defined
6. Add users You want
7. Finish

The simplest thing to do is create a Domain Name Set (not a URL Set) with names like * and add it to the Exceptions Box in the TO Tab of the HTTP/HTTPS Rule you are already using.

No need to create any new Rules.  Simple,...clean,...efficient.
Suliman Abu KharroubIT Consultant Commented:
nslookup returns these IP address for

adding these ip addresses to computer set and put it in exception list in the rule  would return better performance than adding domain name set.

ISA/TMG performs reverse DNS lookups on the IP address to determine whether the IP address matches any of the blocked domain names. Reverse DNS lookups are expensive and often fail or lead to delays.

Could just use a Domain Name Set that includes *

with IP#s I've had more dependable results with an Addrress Set rather than a Computer Set,...not sure why,..but it is what I have experienced.
sns-emeaAuthor Commented:
I got the solution, there were two rule created for different users/group i just added* on both of them and it is working fine now .. Thanks

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sns-emeaAuthor Commented:
It was my mistake :)
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