After further log file analysis I found the blocking ldap query ... it is a BIND request
(which is successfull) and a missing CLOSE afterwards. After 5 minutes the LDAP Server
closes the connection with closetype="T2" (server side timeout). So far so good
(client problem I will fix). I am not sure if this situation blocked the cn=monitor query
in earlier versions, I guess not?!
Once again thank you for your help.
Finally the log of the blocking connection
2021-07-15 10:22:42 +02:00
pldaXXX [15/Jul/2021:10:22:42.916319196 +0200] conn=1228488 CLOSE type=close fd=4751
slot=4751 from=10.XXX.YYY.ZZZ to=10.AA.BB.CCC ssl=true
binddn="gvgid=at:lX:yyyyy,ou=service,dc=ttttt+gvouid=at:l7:lvn:000001,dc=gv,dc=at"
method=128 version=3 op=0 totalop=-1 closestate=normal closetype="T2"
2021-07-15 10:17:41 +02:00
pldaXXX [15/Jul/2021:10:17:41.893466169 +0200] conn=1228488 BIND type=bind op=0
binddn="gvgid=at:lX:yyyyy,ou=service,dc=ttttt+gvouid=at:l7:lvn:000001,dc=gv,dc=at"
method=128 version=3 RESULT op=0 err=0 errname=success tag=97 nentries=0
optime=0.000512268 wtime=0.041730272 etime=0.042240973
resultdn="gvgid=at:lX:yyyyy,ou=service,dc=ttttt+gvouid=at:l7:lvn:000001,dc=gv,dc=at"
CONNECTION fd=4751 slot=4751 from=10.XXX.YYY.ZZZ to=10.AA.BB.CCC ssl=true
binddn="gvgid=at:lX:yyyyy,ou=service,dc=ttttt+gvouid=at:l7:lvn:000001,dc=gv,dc=at"
method=128 version=3 op=0
2021-07-15 10:17:41 +02:00
pldaXXX [15/Jul/2021:10:17:41.850130533 +0200] conn=1228488 OPEN type=open fd=4751
slot=4751 from=10.XXX.YYY.ZZZ to=10.AA.BB.CCC ssl=true