We have been running a virtual machine for past year on Azure, and lately, and only on Win8.1 client - we are getting DNS issues to the internet when connected via Point-to-Site. When connected, and we ping www.google.com, it will randomly timeout and fail - so we cannot browse local, randomly. If I disconnect VPN - it works fine. Our Win7 clients work fine.
What is odd, when connected to the VPN, we cannot ping the virtual IP of the DNS server in Azure (ok, ping may be blocked) - but we also attempted to query the DNS and it did nothing, could not telnet in either.
So - is there a way to find out - is Azure DNS broken or confirm it is working? In the Virtual network setup, DNS is blank so we were only using Azure provided DNS. If something changed, do I need to edit the virtual network, and add some DNS like Google in there to let the WIn8.1 work again?
If we manually add DNS to the VPN network thru netsh commands - it works, but when we re-connect the VPN, the config resets it to just azure DNS IP's. (in our case they are 10.10.1.34, 10.10.1.35 - auto assigned by azure).