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Apache DNS errors

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Apache DNS errors

Bomber1JZ
Hi All,
We are currently running apache 2.2.6 and all is running well. Except we can no longer access our Citrix gateway internally. We type in https://gateway.citrix.com.au and get this error:-

Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request CONNECT gateway.citrix.com.au:443.

Reason: DNS lookup failure for: gateway.citrix.com.au

This has only started happening since we stopped outsourcing our proxy service to MessageLabs and built the internal Apache proxy with SurfControl.

The above address works fine externally - its just internally that is the problem.

Does anyone have any ideas on how to sort this out please??

Cheers

Paul