See here:
UTM Up2Date 9.209 Released | Sophos Blog
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Does firefox or IE also showing an error message?
Yes, on Firefox it shows "The connection was reset". I tried to telnet to the UTM machine on port 4444 it open though. Anyone face the same issue? Its weird because this is a fresh install and i also redownload the ISO twice with the same result.
I also tried on Virtualbox and VMware.
Are you trying to connect via FQDN?
What happend if you use the IP instead the FQDN?
You could try this