DNS cache? Proxy problem when connected to VPN

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[neastx]

I have Endian 3.0 setup running my home network. When i connect to an openvpn server at my workplace everything works fine for about 10 minutes or so. Then i begin getting the DNS error referenced below. It makes sense that Endian cannot do a DNS lookup on the URL because it exists on my company network. when this error occurs, i can still ping the site and resolve it properly on the PC that is connected via openvpn.

If i go to the Endian GUI, turn HTTP proxy off then back on again, i can then go back to the other tab, and reload the remote site and use it for about 10 minutes and then everything stops working again.

Here is a screenshot of the error:    i.imgur.com/Paga9Rh.png

Can someone please help me trouble shoot this? ive tried RTFM, and just about every option i can try in the GUI.