on WinNT is working but on Sun not

[Anon]

Hello,

I have a php page that is working with WinNT, Apache, Oracle but if I try to put it on Sun , same Apache, same Oracle I receive error messages on page submit.
The messages are :
for Netscape \"304: The client has performed a conditional GET request using If-Modified-Since header, but the document has not been modified. The entity body is not sent and the client should use its local copy.\"

for IE: \"IE cannot open the Internet site http..... The server returned an invalid or unrecognized response\"

Thanks for help,
Camelia