Internet access in corporate environment

Dear experts,

I am always wanted to know about these 3 addons in our domain computers. These implementations are done by the application and security guys and I am not involved from the network side.

I want to know what does each application do the computers.

We have implemented Mcafee antivirus and HOst intrusion detection.
We have implemented something on the IE known as Zscaler and it is string *.pac on the IE LAN settings that the desktop guys need to put to give access to the internet.

The other issue I have some users are not able to access websites but we can ping them. What does that mean. When I disable HIPs the site will work.

Another issue I have is some users try to access an internet site but when I ping the site I dont get any replies. Is that a firewall blocking it.

What will be the function of Zscaler in this scenario. Again I am not a desktop person but I want to clarify and give information on it to technicians interms of training.

Thanks, Habib
SR ZakNetwork Solutions Asked:
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Zscaler is a cloud-based Internet security service which basically intercepts all the traffic going from your computers to the Internet and back, and it looks for exploits and violations of your company Internet policy. It acts as a proxy and "man-in-the-middle," decrypting all SSL traffic, inspecting it, and re-encrypting it before sending it on its way. In a different context, this type of interception would be considered an attack, but these are supposedly the good guys.  
Unless your IT folks have set Zscaler to bypass traffic going to banks, medical sites, etc. it is all getting decrypted and inspected, and that for some is a privacy concern, but most users never even know it's going on and assume they have a secure connection to their bank, etc. Not knowing what your company is doing, I can only say that I would avoid doing anything personal on the Internet on work computers. It is important to realize that this is set up per computer, it is not linked to your business network. If you use a work laptop at home, its traffic still all going through Zscaler's cloud infrastructure before getting to the Internet.

As for questions #1 and #3, they are minor points compared to Zscaler. The Mcafee anti-virus and intrusion protection stuff is pretty standard in any enterprise. Regarding #3, it could be the McAfee or it could be the Zscaler blocking your ping, but many Internet servers are set to not respond to pings. It sounds to me like you need to get more info on how Zscaler is set up from your IT Administrator.

Good luck!

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SR ZakNetwork Solutions Author Commented:
That is good explanation.

Do you have any steps to follow if I have a blocked site. I have users who pointed out the issue and I do not know how to troubleshoot inroder to forward requests to the right team.
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