Let me see, what it could be.
For sure I'll edit my post to add a comment about it.
edit #1: you shouldn't provide links like:
http://www.xroxy.com/proxylist.php?p
...liability=9000
but try to use a FF extension like "copy links"
edit #2: 297 x 200 OK
and the winner is:
http://members.tripod.com/~webmaster5/proxylist.txt: last update
1997-08-30
edit #3: my suggestion: better try to post anything not perfect, but done by yourself than obsolete crap done by others