Hi All, I am using check_tcp to check status of a particular port on the server. This is working good. I would also need to monitor LISTEN status (SYN_RECV) of that port. for ex, I have a ldap service running on port 3890, so the command netstat -anp | grep 3890 tcp 0 0 <a href="http://0.0.0.0:3890">0.0.0.0:3890</a> 0.0.0.0:* LISTEN 16029/java tcp 0 0 <a href="http://10.121.30.121:3890">10.121.30.121:3890</a> <a href="http://10.121.6.1:8831">10.121.6.1:8831</a> ESTABLISHED 16029/java tcp 0 0 <a href="http://10.121.30.121:3890">10.121.30.121:3890</a> <a href="http://10.121.6.1:61052">10.121.6.1:61052</a> ESTABLISHED 16029/java tcp 228 0 <a href="http://10.121.30.121:3890">10.121.30.121:3890</a> <a href="http://10.121.6.1:49440">10.121.6.1:49440</a> ESTABLISHED 16029/java tcp 0 0 <a href="http://10.121.30.121:3890">10.121.30.121:3890</a> <a href="http://10.121.6.1:11664">10.121.6.1:11664</a> SYN_RECV 16029/java The establish connections are ok to allow, but we need to monitor SYN_RECV status. If there is any such(SYN_RECV) connection appears, we immediately get an alert from nagios. Is there any way to monitor such states with nagios or check_tcp? I have written some shell script to monitor such events, but also I would like to integrate that scripts into nagios? Is that possible? Please help me Thanks -- Shankar