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DNS stops resolving name in Remote Access VPN

Dear Mates

I have currently migrated our Remote Access VPN to Check Point, and everything seems to be working. However, from time to time, there is a problem with DNS resolving the names. when this happens, it displays the message in the photo bellow. Since I dont know the cause of the problem, sometimes a workaround that I found is to push the policy again on the firewall where the RA is terminated, and then it works just fine.

Any idea on what could be causing this, and how it can be resolved?

Thanks in advance

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6 Replies
ED
Silver

Re: DNS stops resolving name in Remote Access VPN

Hi,

I had recently the same problem with DNS for another situation. In my case it was problem with the "forwarders" for the DNS server itself. Also the Server: unknown information is related to the "Reverse lookup zone" for your DNS-server. (if you don't have a reverse lookup for your DNS server).

Re: DNS stops resolving name in Remote Access VPN

HI Enis,

Thanks for your help.

But how do I fix this problem once and for all.

Regards

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ED
Silver

Re: DNS stops resolving name in Remote Access VPN

May I ask if you are using Windows server for DNS so that I can try to explain what I meant?

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Re: DNS stops resolving name in Remote Access VPN

Hi Enic 

Yes, we are using Windows Server for DNS.

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ED
Silver

Re: DNS stops resolving name in Remote Access VPN

Open up DNS manager. On top select your DNS server, right-click and select Properties. On the new window select "Forwarders" tab. Do you have anything there? You can try to use forexample 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).

Also check in DNS manager if you have reverse lookup zone for your domain. 

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Admin
Admin

Re: DNS stops resolving name in Remote Access VPN

Recommend a TAC case for this issue.