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We have a 2003 domain with roughly 65K users. This domain also has a mixed
2003 / 2007 Exchange Org. At our site there are 3 domain controllers that
are 64 bit and have 32 GB of memory to cache the entire directory. Now MOM
and another product NetQOS, are reporting constantly that many of our DC / GC
are unresponsive and usually to LDAP queries on port 389. These DC are
running Virus Scan but have the exclusions as per Microsoft. Now I did find
the MaxPageSize and MaxValRange had been messed with due to some other
programs that use LDAP lookups. Our DC / GC have now been set back to the
default 1000 and 1500 settings respectively but are still showing these LDAP
delays and Unresponsive session. Now normally the GC on port 3268 does not
show the same excessive or degraded performance as the LDAP. Just trying to
figure out what is being missed that might cause these LDAP issues. Windows
Firewall is not running on these systems either.
Any ideas what else to check? Thanks!!
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