How to block a website from ISA 2006

Even after adding the link for e.g. http://www.youtube.com/* 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 ?
sns-emeaAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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?
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

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

pwindellCommented:
The simplest thing to do is create a Domain Name Set (not a URL Set) with names like *.evilsite.com 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 www.youtube.com

 213.139.49.83
 213.139.49.90
 213.139.49.84
 213.139.49.86
 213.139.49.80
 213.139.49.89
 213.139.49.87


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.


pwindellCommented:
Could just use a Domain Name Set that includes *.youtube.com

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 youtube.com/* on both of them and it is working fine now .. Thanks

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
sns-emeaAuthor Commented:
It was my mistake :)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Forefront ISA Server

From novice to tech pro — start learning today.