errors 91 on smps.log

Document ID : KB000095806
Last Modified Date : 15/05/2018
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Issue:
We're running a Policy Server, and this one reports LDAP Error 91
when connecting to the second Policy Store. We have 2 Policy Servers,
each one has 1 LDAP Policy Store instance running on its machine.

smps.log

 [7577/1][Mon May 14 2018 11:45:54][smldaputils.cpp:478][INFO] Opening
 policy store connection to LDAP server: ' mypolicyserver-principal:389 '

 [7577/15][Mon May 14 2018 11:45:53][SmObjLdapConnMgr.cpp:578][ERROR]
 SmObjLdapConnMgr Bind. Server mypolicyserver-failover:389. Error 91 - Can't
 connect to the LDAP server

How can we solve this ?
Resolution:
On the second Policy Server, we started the LDAP instance. When
it was up and running, then the error seen in the Primary Policy
Server disapeared.