Preventing connection problems with multiple LDAP sessions

On the Microsoft Windows operating system, the IBM Security Directory Server supports a default of 64 concurrent connections. Connection attempts beyond 64 connections from ISIM Server fail and display a Directory Server not available error message like this example:

Connection pool exceeded: directory server not available

To limit connection problems, define the value of SLAPD_OCHANDLERS to increase the available connections.

1. Locate the following stanza in the ibmslapd.conf file:

   dn: cn=Front End, cn=Configuration

   The default directory of the ibmslapd.conf file depends on the operating system.

   Microsoft Windows systems

   C:\idssldap-ldapdb2\etc

   UNIX and Linux systems

   /home/ldapdb2/idsslapd-ldapdb2/etc

2. Add the following line to this stanza:

   ibm-slapdsetenv: SLAPD_OCHANDLERS=number-of-threads

   One thread supports 64 connections. If there are multiple instances of ISIM Server, increase this value. If there are two instances of the server, each requiring a minimum of 50 simultaneous LDAP connections, specify a value of 2 or larger. For example, add this line to the following stanza:

   ibm-slapdsetenv: SLAPD_OCHANDLERS=4

3. Save the changes.
4. Restart the IBM Security Directory Server so that the changes take effect.

Parent topic: Troubleshooting IBM Security Directory Server problems