Whoops, don't I look stupid, the exact error was:

 _X11TransSocketINETConnect: Can't connect: errno = 113
 Error: Can't open display: p15-max.ham.ihug.co.nz:0.0
 
Thanks for the replies, I'll give the tcpdump a try tonight when my flatmates
let me tie up the phoneline :)

 Cheers, James

-- 
James Shiell - jwds1@cs.waikato.ac.nz
             - http://shiell.cjb.net/