More info
On further investigation It appears there is a problem with a config setting that helps build the REQUEST_URI. The refering post and request URI post numbers are correct.
The 404 error is produced
<!--#echo var="HTTP_REFERER" -->
http://testdomian.net/forums/ubbthr...amp;page=1&what=showflat&fpart=1<!--#echo var="REQUEST_URI" --> /public_html/forums/ubbthreads.php?ubb=showflat&Number=86965&page=0
<!--#echo var="HTTP_HOST" --> testdomain.net
<!--#echo var="HTTP_REFERER" --> 404
Time to go look at the config file closely.
Abbott