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Unable to resolve host address

rE3RUste
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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  • 0
    Do you have a masq rule for the DMZ network?
    Do you have firewall rules to allow outbound traffic from the DMZ?
    How is your DNS setup for the DMZ hosts/network?
    Is the DMZ network setup to use the web proxy?

    Your not the first person to post here that is having issues after following that write-up.  That article is to setup for serving from your server, but it is incomplete for anything else.
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  • 0
    Do you have a masq rule for the DMZ network?
    Do you have firewall rules to allow outbound traffic from the DMZ?
    How is your DNS setup for the DMZ hosts/network?
    Is the DMZ network setup to use the web proxy?

    Your not the first person to post here that is having issues after following that write-up.  That article is to setup for serving from your server, but it is incomplete for anything else.
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