can't reinstall plex media server (building dependency tree)

i was having issues with my plex media server after i moved my nasbox to a different place in the house. it has a static ip, and everything is the same, from when it was working, but somehow moving it has caused the plex server to no longer work. in the services tab it was showing as enabled, but with a red dot instead of a blue dot. so after a few hours of searching and enabling reenabling and reinstalling the plunging, i decided to start anew.

i completely reinstalled OMV and this time i updated all of the updates/installed the extras repo and then am trying to install plex. instead of installing, it is just sitting on the install screen with..

Reading package lists...
Building dependency tree...

no matter how long i let it sit, it will not continue. every other plugin i try to install works fine. after an apt-get update, these errors were thrown out at the end...

W: Failed to fetch http://shell.ninthgate.se/packages/debian/dists/squeeze/Release.gpg Could not connect to shell.ninthgate.se:80 (195.22.88.165). - connect (111: Connection refused)W: Failed to fetch http://shell.ninthgate.se/packages/debian/dists/wheezy/Release.gpg Unable to connect to shell.ninthgate.se:http:W: Some index files failed to download. They have been ignored, or old ones used instead.

is the plex server down or have i screwed something royally? appreciate the help

ok thank you. was wondering if i was going crazy. by chance, is there a way that i can check if a repo is down myself? like a ping command or something? I'm still new to linux & i like knowing how to do things and figuring out issues so i don't have to keep asking for help.