Error Code 4.8

My Jump desktop client has stopped working for about 3 days. I have made no changes to my computer and can still connect to 2 other machines on the same network, again, no changes. I have tried uninstalling, restarting and resetting all settings / re-logging in and nothing has helped. I keep getting Error Code 4.8, it is driving me mad that I can't use jump desktop. Any help is much appreciated.