Users of Windows 7 Computers connected to Domain but can not get Internet Randomly

After crash of DC, I have replaced the domain controller server 2008 with another machine but with same name. I got trust relationship issue, which I resolved by disjoining and rejoining. After this I am facing below mentioned issue on computers randomly.
High Privileges users have no issue with internet access. Low privileges users can not access internet on workstations randomly. Users login properly, all group policy settings applied to them. but internet does not work with them using Internet Explorer
and Google Chrome. All pings work fine. I viewed the proxy settings by command line as proxy settings are disabled for low privileges users. It was correct but still internet was not working. While over Firefox by adding manually proxy(not set
through group policy), internet works.
When I tried to login through a new user which has not logged in over affected machine. Internet works. After logging off by new user and logging on old users (already created profiles), internet starts working for them too. I am afraid may this trick does
not work on other machines.
Now I want to know, if above mentioned trick does not work what should I do to activate the internet. What is the root cause of this issue.

Hi,
Did you mean you set the same proxy, high privileges user could keep connection and low privileges user drop connection randomly? At the same time, Firefox also could keep connection, right?
Please try to reset Winsock and DNS for a test on problematic computer. Open command prompt with Administrator Previleges, then type the following commands.
netsh int reset  
ipconfig /flushdns   
Besides that, update the network driver for test.
Karen Hu
TechNet Community Support

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