Welcome!

I was in the same boat. Mine was caused by NordVPN. Had to uninstall it for Runemate to work. Currently unsure how to have both active.

This SOLVED it for me. I'm still running both Runemate and osrs client in admin + windows 8 compatibility mode. All I did was uninstall NordVPN + restart and now it's all working. Thank you so much. Never would have guessed this. Would be great to know what the connection error is or how to have...

I don't think I've used NordVPN while trying to run Runemate but that's definitely something I can try. I'm getting same error. Thank you for the post.

No idea how to fix it. I've uninstalled both runemate and runescape clients + Java, restarted and reinstalled about 20 times now. Also deleted Jagex and Runemate cache with no luck. Ran both the osrs client and runemate in every combination of admin and compatibility mode (All ran on Windows...