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Unable to resolve host address

Hello,

I have set up sophos 9 UTM on my network for both internal network and DMZ for webserver. Everything works perfectly in the internal network and the website on the webserver can be  accessed from the internet however I cannot access the internet from the DMZ (webserver). If i try to reach a website from the webserver i get the following error: "Unable to resolve host address".

I followed the configuration posted on howtoforge and everything is identiacal to the following post:
https://www.howtoforge.com/how-to-protect-your-web-server-with-sophos-utm

I have tried to tweak with firewall options but with no luck?

Has anyone any idea of why this is happening and how to resolve this?

Thanks,
George


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