Dell E6440 WatchGuard SSL DNS problem

We got big problems with 30 Dell E6440 Laptops and WatchGuard SSL VPN. After connect ssl DNS doesnt respond with out ipconfig /flushdns and ipconfig /registerdns. Okay dns starts respond after 20-30mins. This is not configuration problem. We try with couples HP and clone computers. This problem wont issue those. Those problem computer is cloned Dell factory image with sysprep.

I try to install Win7 MSDN downloaded image and testing SSL connect with that. Everything works fine. ping responds with dns name. I think problem is dell factory image. Tried update drivers and Win7 has latest updates.
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Since you have working system without dell addons why dont you just use it???
SamiKarhulaAuthor Commented:
Problem solved. Sierra WWAN drivers uninstall solved that. Those drivers stuck somehow DNS update

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SamiKarhulaAuthor Commented:
I locate problem reason to Sierra WWAN drivers. Uninstall those everything works fine
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