Dear Simon, I have a problem on my system, Fatal error: Pid file [/usr/local/var/run/perdition.pop3/perdition.pop3.pid] exists for process [859] which appears to be running, exiting In the maillog I found the followings Sep 11 12:37:57 ospop4 perdition[30895]: version=1.18, add_domain="all,1", authenticate_timeout=1800, bind_address="", capability="UIDL USER", client_server_specification=off, config_file="/usr/local/etc/perdition/perdition.pop3.conf", connection_limit=0, connection_logging=off, connect_relog=300, debug=on, domain_delimiter="@", explicit_domain="pacific.net.hk", group="nobody", inetd_mode=off, listen_port="110", log_facility="mail", log_passwd="never", login_disabled=off, lower_case="", map_library="/usr/local/lib/libperditiondb_ldap.so.0", map_library_opt="ldap://osldap.pacific.net.hk/o=pacnet?uid,mailhost?sub?(&(| (uid=%s)(mail=%s)(mailAlternateAddress=%s))(accountstatus=active)(emailcos=p op3))", no_bind_banner=off, no_daemon=on, no_lookup=on, nodename="ospop4", ok_line="You are so in", outgoing_port="110", outgoing_server="mx-pop.pacific.net.hk:110", pid_file="/usr/local/var/run/perdition.pop3/perdition.pop3.pid", protocol="POP3", server_resp_line=on, strip_domain="", timeout=1800, username="nobody", username_from_database=off, query_key="", quiet=off, ssl_mode="", ssl_ca_file="", ssl_ca_path="/usr/local/etc/perdition/perdition.ca/", ssl_ca_accept_self_signed="off", ssl_cert_file="/usr/local/etc/perdition/perdition.crt.pem", ssl_cert_accept_expired="off", ssl_cert_not_yet_valid="off", ssl_cert_self_signed="off", ssl_cert_verify_depth=9, ssl_key_file="/usr/local/etc/perdition/perdition.key.pem", ssl_listen_ciphers="", ssl_outgoing_ciphers="", ssl_no_cert_verify="off", ssl_no_cn_verify="off", (ssl_mask=0x00000000) (mask=0x00000000 00000000)#012 Sep 11 12:37:57 ospop4 perdition[30895]: Fatal error: Pid file [/usr/local/var/run/perdition.pop3/perdition.pop3.pid] exists for process [859] which appears to be running, exiting Sep 11 12:37:57 ospop4 perdition[30895]: main: write_pid_file Sep 11 12:37:57 ospop4 perdition[30895]: Could not write pid file Sep 11 12:37:57 ospop4 perdition[30895]: Exiting on signal 1 We have tried to restart the process, but it cannot help. Until we reboot the system the service is recovered. Is there any fix on that. We are using version 1.18 and running on Red-Hat 4.4.7-4. Thanks. Maverick Ip Senior Engineer Network Services WTT HK Limited sign 9/F, KITEC, 1 Trademart Drive, Kowloon Bay, Hong Kong Email : <mailto:maverickip@wtthk.com.hk> maverickip(a)wtthk.com.hk | Direct Line : (852) 2112 2492 General Line : (852) 2112 1121 | Fax : (852) 2112 2900 <http://www.wtthk.com.hk/> www.wtthk.com.hk