Linux VPNC not working

If you're using VPNC for VPN'ing with Linux (sudo aptitude install vpnc) and it just won't authenticate, even though you're sure all your information is correct, as a last resort double check that you don't have trailing spaces after any of the lines in your /etc/vpnc/*.conf file. Spaces after any of these lines are significant.

Especially if you're editing your .conf files with vim, this is an easy mistake to make.