[Serusers] SER <==> SEMS fifo permisions problem

Hi All ! I'm implementing SER, SEMS server, I've configured fifo as communication method between them (folowing install manual). In ser.cfg I've enabled conference part in INVITE message route handling as follows : if (uri=~"sip:100.*@") { if (!t_newtran()){ sl_send_reply("500","Could not create transaction"); break; }; t_reply("100","Trying - just wait a minute !"); # assumes that Sems configuration parameter 'socket_name=' # has been set to /tmp/am_sock if(!t_write_req("/tmp/am_fifo","conference")) { t_reply("500","error contacting sems - in uri check 100"); }; break; }; I can make a call on sip:100.*, but I don't have received any announcement and in /var/log/syslog I see following problems with SEMS and more oftenly with fifo permisions: Aug 1 14:30:09 mail Sems[25848]: Error: (SerClient.cpp)(read_from_fifo)(286): no more retries! Aug 1 14:30:09 mail Sems[25848]: Error: (SerClient.cpp)(read_from_fifo)(287): last error: Success Aug 1 14:30:09 mail Sems[25848]: Error: (SerClient.cpp)(send)(137): while reading Ser's response. Aug 1 14:30:09 mail Sems[25848]: Error: (AmRequest.cpp)(send)(219): while sending request to Ser Aug 1 14:30:15 mail Sems[25852]: Error: (SerClient.cpp)(read_from_fifo)(286): no more retries! Aug 1 14:30:15 mail Sems[25852]: Error: (SerClient.cpp)(read_from_fifo)(287): last error: Success Aug 1 14:30:15 mail Sems[25852]: Error: (SerClient.cpp)(send)(137): while reading Ser's response. Aug 1 14:30:15 mail Sems[25852]: Error: (AmRequest.cpp)(send)(219): while sending request to Ser Aug 1 14:33:28 mail /usr/sbin/ser[25731]: ERROR: open_reply_pipe: open error (/tmp/0000660D1443C4FC): Permission denied Aug 1 14:33:28 mail /usr/sbin/ser[25731]: ERROR: fifo_reply: no reply pipe /tmp/0000660D1443C4FC Thanks palo