After installing UTM 9 it appears that Windows update will not check for updates when the Web Proxy is set in transparent mode and SSL Scanning is enabled with the proxy CA imported as a Trusted Root Certificate Authority. Upon checking for updates I get error code 80244004. Without UTM 9 there are no errors checking for updates.
--Update--
I have now gone to every computer on my network and this happens on each and every one of them. When I connect a PC directly up to my cable modem there is no problem at all.
--Update--
I have now gone to every computer on my network and this happens on each and every one of them. When I connect a PC directly up to my cable modem there is no problem at all.