If you are using a set-top box such as MAG or AVOV and have just set up your device with our service, you will need to perform a hard reset of your device. Simply power off your device, unplug your power cable and re-plug it in.
You could have an issue that affects many MAG devices. Certain MAG devices cannot handle large content lists and your Device resets and shows the bar that never finishes loading. This is because the list is too large for your device's memory and can't load it entirely, so you may need to edit your channel list. You can do this by login in to your client area, then go to your SERVICE and select the one you need to edit. Click on IPTV Service Details, and just select the countries or group of channels that you need. Remember to uncheck "Full user" or it won't work.
you could try with this portal URL too: http://link.comstar.tv:6969/c/
For Kodi, you will need to clear your cache. If unsuccessful, attempt a re-install of Kodi itself.