Found the issue.
Related to a very very strange D-Sync issue. Changing my modem fixed this and has not happened sense. Nothing wrong with the modem but maybe they way it handled the Arma3 packets or loss of packets.

Hi Razazel, So after the update I could joing all other servers. Still had the issue with it getting stuck. But hopefully I have fixed that now.

Here you go.
Thanks

Cheers for helping Razazel,

Also, forwarded all ports required for arma. Also Exposed host (DMZ) "my game pc" on the router to make sure something wasn't causing the issues router side. still same issue.

Thanks Razazel.

Same issue,