https://community.extremenetworks.com/t5/extremecloud-iq-site-engine/emc-upgrade-8-0-os-upgrade-problem/m-p/21306#M1254 Problem solved: A few firewalls have an intermediation page, which shows the 503 as well.<BR /> So that was related to the firewall, not to the server<BR /> Wed, 26 Jul 2017 13:40:00 GMT Chacko 2017-07-26T13:40:00Z https://community.extremenetworks.com/t5/extremecloud-iq-site-engine/emc-upgrade-8-0-os-upgrade-problem/m-p/21305#M1253 Hi,<BR /> <BR /> when starting the installer-file to upgrade EMC from 7.1.2.12 to 8.0.2.42, the installer tries to update the OS.<BR /> After executing the file, it aborts because "internet connection cannot be established".<BR /> I sniffered the data traffic from the appliance and found out, that he does a name resolution on "security.ubuntu.com" with 91.189.91.23.<BR /> After that a http-Request with get /ubuntu is generated, but that one failes with 503 - service unavailable.<BR /> <BR /> I accessed this page manually in the web browser and the website is working.<BR /> I also tried other IPs from the pool security.ubuntu.com, but that hasn't worked either.<BR /> <BR /> Does anyone experienced the same problem?<BR /> <BR /> Best Regards<BR /> Chacko<BR /> Wed, 26 Jul 2017 12:56:00 GMT https://community.extremenetworks.com/t5/extremecloud-iq-site-engine/emc-upgrade-8-0-os-upgrade-problem/m-p/21305#M1253 Chacko 2017-07-26T12:56:00Z https://community.extremenetworks.com/t5/extremecloud-iq-site-engine/emc-upgrade-8-0-os-upgrade-problem/m-p/21306#M1254 Problem solved: A few firewalls have an intermediation page, which shows the 503 as well.<BR /> So that was related to the firewall, not to the server<BR /> Wed, 26 Jul 2017 13:40:00 GMT https://community.extremenetworks.com/t5/extremecloud-iq-site-engine/emc-upgrade-8-0-os-upgrade-problem/m-p/21306#M1254 Chacko 2017-07-26T13:40:00Z