I started getting this error message in June. Before that everything was working fine and nothing had been changed. The error code suggests that a firewall is blocking the connection. There is NO firewall since I have a different type of virus/spyware/malware protection. Sling support suggested that the router might be old, which it was. So now I have updated the router with a new version (a Linksys E1000) and am still getting the same error message, am not able to connect at home or remotely. Any ideas? I'm about to use this Sling Classic box as my cat litter box scraper!