Shut down your wireless router (just pull the plug). Wait 30 seconds then plug it back in.
Then for good measure, also shut down & restart your hudl after the router shows ready to use (no error lights flashing).
I do really mean shut down/restart your hudl; just turning it's screen off & on will not suffice.
[EDIT] This forum is for Windows XP problems, not Android devices. Please use the most appropriate forum in future - - thanks.