[Serusers] ser_fifo gives timeout

Hi guys, I dont know what the problem is.. Really.. Im out of ideas with permissions and reinstallations for serweb's CTD and IM. During my 1st installation with serweb they both worked fine. Then I had to reinstall my OS (Ubuntu 7.x btw) and now they give both timeouts.. I have even copied send_im() and write2fifo() functions separately into a PHP file and ran it from command line. Same old "408 Request Timeout".. Please, suggest something. Im basically using nat-mediaproxy.cfg for config file and I have tried setting various ownerships and permissions to serweb dir and for /tmp/serweb and /tmp/ser_fifo.. Nothing helps really. All packages are installed for php4 including php4-cli, pear, pear-log, pear-DB, XML_RPC and even classkit (which is useless here anyway).