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Internet outage every xx minutes

Hello

 

i'm new in the company and they have here installed 2 XG firewalls( HA )

 

Every XX minute there is a internet outage for the whole site , and after 30 -60 seconds internet is back , this repeats every time.

 

What i already see and tested 

If i ping google.com - t   before  the outage then it resolve the ip addres and have correct ping's

If i ping google.com -t  when there is a outage , it resolve the ip address but have time outs on the ping , when the internet come's back then i have correct pings

 

Also strange thing : if there is a internet outage on a  TS session , then it is possible that on the local machine there is no outage

It's never the whole site in once , but the most works on a TS-server so all the people who work on this machine have on the same time this problem.

 

The company who delivers the firewall can't also find the problem ( they told they take contact with sophos) and the situation like this is already more then a Year.

 

Someone a  idea where the problem could be ??



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