Proxy setting confusion


I have confusion about Proxy setting in my organization.
When we need to use internet,
Some PC need to fix proxy server, and some PC no need to setting it.
I don't know what happens,

Could someone let me know what happens?
Songphon JAsked:
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Cris HannaSr IT Support EngineerCommented:
Do you have a, linux, whatever that all Web requestsite must go through?

well you don't want to help us to help you. We need a litle bit more infos about your network:
Is all PC in the same subnet (like 192.168.0.x for all)?
What is your internet connector device?
When you use a proxy server you use what exactly?

Songphon JAuthor Commented:
Thanks all

Look seem i found the root cause,
Current environment we have Microsoft ISA server (Firewall and Proxy role).
And we use WPAD including proxy server, We lease WPAD from DHCP, that mean user who get DHCP no need to specify proxy server,

If client use Static IP that mean need to specify proxy server.

Thank everyone

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Songphon JAuthor Commented:
The solution is correct
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