[Serusers] Fifo Error - Please help?!?!

Hi, I'm new to Sip and Ser and am having trouble getting the fifo to work correctly. This is the error I see: Warning: fopen(/var/tmp/ser1_fifo) [function.fopen]: failed to create stream: Permission denied in /usr/local/apache/htdocs/serweb/functions.php on line 172 I have tried with ser_fifo in the /tmp directory as specified in the the installation guide with the same errors. I have tried changing the owner / group permissions as well as who owns the file to no avail. The error comes up when the file is accessible by root, if I change it to apache or any other user the system will not load at all...help?!?!? Thanks in advance for any help. Todd