Hi, Does anyone have any clue on the following problem? I recompiled and installed SER in Redhat Linux 8.0. Unfortunately I tried all the possible options (debug level) in the ser.cfg, but the only messages I could see in the /var/log/messsages are as follows. Mar 14 17:56:49 dda ser[15303]: INFO: udp_init: SO_RCVBUF is initially 65535 Mar 14 17:56:49 dda ser[15303]: INFO: udp_init: SO_RCVBUF is finally 262142 Mar 14 17:56:49 dda ser[15303]: INFO: udp_init: SO_RCVBUF is initially 65535 Mar 14 17:56:49 dda ser[15303]: INFO: udp_init: SO_RCVBUF is finally 262142 Mar 14 17:56:49 dda ser[15303]: INFO: udp_init: SO_RCVBUF is initially 65535 Mar 14 17:56:49 dda ser[15303]: INFO: udp_init: SO_RCVBUF is finally 262142 Mar 14 17:56:49 dda ser[15316]: INFO: fifo process starting: 15316 Mar 14 17:56:49 dda ser[15316]: SER: open_uac_fifo: fifo server up at /tmp/ser_fifo... What should I do to see the detailed debugs? Thanks, Bo