All,

          I have been struggling with upgrading OpenLDAP from 2.4 to 2.5/2.6 for some time.  We have finally found that we needed to rebuild the schema from scratch and re-add our customizations.   The database is now running much better with one lingering problem.  Our Established connections just continues to grow until we run out of resources.  Below is our cn=config (minus some unrelated info).  This is on the same server as where the previous version was running, so changes are openldap and openssl versions.  Any insights as to what might be causing the ESTABLISHED connections to continually grow would be very appreciated.

# AUTO-GENERATED FILE - DO NOT EDIT!! Use ldapmodify.

# CRC32 422b88f4

dn: cn=config

objectClass: olcGlobal

cn: config

olcAttributeOptions: lang-

olcConcurrency: 0

olcConnMaxPending: 100

olcConnMaxPendingAuth: 1000

olcGentleHUP: FALSE

olcIdleTimeout: 0

olcIndexSubstrIfMaxLen: 4

olcIndexSubstrIfMinLen: 2

olcIndexSubstrAnyLen: 4

olcIndexSubstrAnyStep: 2

olcIndexHash64: FALSE

olcIndexIntLen: 4

olcListenerThreads: 1

olcLocalSSF: 71

olcLogLevel: 256

olcLogFileOnly: FALSE

olcMaxFilterDepth: 1000

olcReadOnly: FALSE

olcSaslAuxpropsDontUseCopyIgnore: FALSE

olcSaslSecProps: noplain,noanonymous

olcSockbufMaxIncoming: 262143

olcSockbufMaxIncomingAuth: 16777215

olcThreads: 16

olcThreadQueues: 1

olcTLSCRLCheck: none

olcTLSVerifyClient: never

olcTLSProtocolMin: 0.0

olcToolThreads: 1

structuralObjectClass: olcGlobal

creatorsName: cn=config

createTimestamp: 20220726200129Z

olcAuthzPolicy: any

olcWriteTimeout: 30

olcSizeLimit: size.soft=unlimited size.hard=unlimited size.unchecked=unlimited

  size.pr=1000 size.prtotal=unlimited