Tried all these things, no luck.
Tried disabling the firewall, made sure I had the correct team number, etc. Also, as far as I can tell, all ips are set correctly, no conflicts (robot set to 10.34.7.2, classmate to 10.34.7.5, development laptop set to 10.34.7.6)
We have the default code downloaded to the robot, we got help from another team. But, now we can't download any new code due to this error. The default program can be run by the Classmate with the driver station.
EDIT: Ok, re-imaged the crio, to see if that would help. It didn't, but it has a new error message. The first error message is the same, but now the second one is:
Error connecting to 'VxWorks6x_10.34.7.2'(Registry localhost). Failed to launch target server
Possibly caused by: Target Server died unexpectedly during start up with exit code '0'..
Removed dead entry from Registry!
SECOND EDIT: The probelm has mysteriously disappeared. Glad it works, thanks for everyone's help.