Re: (ITS#4420) Hanging CLOSE_WAIT connections in ldap-backend

[ando@sys-net.it]

I have no clear idea as per why this happens; back-ldap refreshes
connections when a LDAP_SERVER_DOWN is returned; the fact that your logs
report a LDAP_UNAVAILABLE (52), which is exactly the ldap response code
mapping of the client library error LDAP_SERVER_DOWN, seems to indicate
that the error is detected correctly, but connection refresh for some
reason doesn't occur.  I note that the correct handling of these
conditions, as far as they can be reproduced, is routinely tested
(partly in the test suite, partly in a private test suite that we
routinely run at SysNet), so I'm positive the software is working as
intended.  It would be of interest to trace a bit more what's happening.
To do that, you could add "args" and "trace" to the log level when the
problem occurs.  You can do that via the cn=config or the cn=monitor
interface without restarting the server; or, if you can live with very
verbose log for 30 min, you can start slapd with that log level.

p.




Ing. Pierangelo Masarati
Responsabile Open Solution
OpenLDAP Core Team

SysNet s.n.c.
Via Dossi, 8 - 27100 Pavia - ITALIA
http://www.sys-net.it
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