Thanks for your assistance Rob. We had an admin hit refresh on the users page and I tailed all log files in /var/log/dirsrv/slapd-<domain>/. Other than anonymising the domain the logs are a direct copy. Interestingly, nothing new appeared in the error log (last entry was yesterday) though the access log appears to indicate errors (err=32/err=14):
==> /var/log/dirsrv/slapd-DOMAIN-NZ/access <== [18/Jul/2019:10:21:32.743893901 +1200] conn=579 op=8 SRCH base="cn=accounts,dc=domain,dc=nz" scope=2 filter="(&(uid=mailer-daemon)(objectClass=posixAccount)(uid=*)(&(uidNumber=*)(!(uidNumber=0))))" attrs="objectClass uid userPassword uidNumber gidNumber gecos homeDirectory loginShell krbPrincipalName cn memberOf ipaUniqueID ipaNTSecurityIdentifier modifyTimestamp entryusn shadowLastChange shadowMin shadowMax shadowWarning shadowInactive shadowExpire shadowFlag krbLastPwdChange krbPasswordExpiration pwdattribute authorizedService accountexpires useraccountcontrol nsAccountLock host logindisabled loginexpirationtime loginallowedtimemap ipaSshPubKey ipaUserAuthType usercertificate;binary mail" [18/Jul/2019:10:21:32.744157672 +1200] conn=579 op=8 RESULT err=0 tag=101 nentries=0 etime=0.0000454722 [18/Jul/2019:10:21:56.677736243 +1200] conn=583 fd=105 slot=105 connection from 172.30.2.21 to 172.30.2.21 [18/Jul/2019:10:21:56.679982423 +1200] conn=583 op=0 BIND dn="" method=sasl version=3 mech=GSS-SPNEGO [18/Jul/2019:10:21:56.682418635 +1200] conn=583 op=0 RESULT err=0 tag=97 nentries=0 etime=0.0002650664 dn="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" [18/Jul/2019:10:21:56.689593794 +1200] conn=583 op=1 SRCH base="cn=ipaconfig,cn=etc,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs=ALL [18/Jul/2019:10:21:56.690482586 +1200] conn=583 op=1 RESULT err=0 tag=101 nentries=1 etime=0.0000963835 [18/Jul/2019:10:21:56.691860968 +1200] conn=583 op=2 SRCH base="cn=ipaconfig,cn=etc,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs="ipaDefaultLoginShell ipaCertificateSubjectBase ipaUserSearchFields ipaSELinuxUserMapDefault ipaUserAuthType ipaGroupSearchFields ipaDefaultPrimaryGroup ipaPwdExpAdvNotify ipaDomainResolutionOrder ipaDefaultEmailDomain ipaHomesRootDir ipaSearchTimeLimit ipaKrbAuthzData ipaMigrationEnabled ipaSearchRecordsLimit ipaConfigString ipaMaxUsernameLength ipaSELinuxUserMapOrder" [18/Jul/2019:10:21:56.692082704 +1200] conn=583 op=2 RESULT err=0 tag=101 nentries=1 etime=0.0000316244 [18/Jul/2019:10:21:56.693128113 +1200] conn=583 op=3 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(cn=CA)" attrs="ipaConfigString cn" [18/Jul/2019:10:21:56.693610138 +1200] conn=583 op=3 RESULT err=0 tag=101 nentries=1 etime=0.0000542056 [18/Jul/2019:10:21:56.694663398 +1200] conn=583 op=4 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=1 filter="(objectClass=ipaConfigObject)" attrs="cn" [18/Jul/2019:10:21:56.695124028 +1200] conn=583 op=4 RESULT err=0 tag=101 nentries=2 etime=0.0000526921 [18/Jul/2019:10:21:56.695909846 +1200] conn=583 op=5 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(&(cn=CA)(ipaConfigString=caRenewalMaster))" attrs=ALL [18/Jul/2019:10:21:56.696468573 +1200] conn=583 op=5 RESULT err=0 tag=101 nentries=1 etime=0.0000620511 [18/Jul/2019:10:21:56.697116946 +1200] conn=583 op=6 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(cn=CA)" attrs="ipaConfigString cn" [18/Jul/2019:10:21:56.697520000 +1200] conn=583 op=6 RESULT err=0 tag=101 nentries=1 etime=0.0000470211 [18/Jul/2019:10:21:56.698159853 +1200] conn=583 op=7 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=1 filter="(objectClass=ipaConfigObject)" attrs="cn" [18/Jul/2019:10:21:56.698567839 +1200] conn=583 op=7 RESULT err=0 tag=101 nentries=2 etime=0.0000464594 [18/Jul/2019:10:21:56.699430708 +1200] conn=583 op=8 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(|(cn=HTTP)(cn=KDC)(cn=KPASSWD))" attrs="ipaConfigString cn" [18/Jul/2019:10:21:56.700805669 +1200] conn=583 op=8 RESULT err=0 tag=101 nentries=6 etime=0.0001447294 [18/Jul/2019:10:21:56.702777108 +1200] conn=583 op=9 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=1 filter="(objectClass=ipaConfigObject)" attrs="cn" [18/Jul/2019:10:21:56.703187156 +1200] conn=583 op=9 RESULT err=0 tag=101 nentries=2 etime=0.0000470000 [18/Jul/2019:10:21:56.703991617 +1200] conn=583 op=10 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(&(cn=KDC)(ipaConfigString=pkinitEnabled))" attrs=ALL [18/Jul/2019:10:21:56.704608201 +1200] conn=583 op=10 RESULT err=0 tag=101 nentries=2 etime=0.0000683819 [18/Jul/2019:10:21:56.705498825 +1200] conn=583 op=11 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(|(cn=HTTP)(cn=KDC)(cn=KPASSWD))" attrs="ipaConfigString cn" [18/Jul/2019:10:21:56.706796444 +1200] conn=583 op=11 RESULT err=0 tag=101 nentries=6 etime=0.0001368352 [18/Jul/2019:10:21:56.708749851 +1200] conn=583 op=12 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=1 filter="(objectClass=ipaConfigObject)" attrs="cn" [18/Jul/2019:10:21:56.709139727 +1200] conn=583 op=12 RESULT err=0 tag=101 nentries=2 etime=0.0000448452 [18/Jul/2019:10:21:56.709984111 +1200] conn=583 op=13 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(cn=NTP)" attrs="ipaConfigString cn" [18/Jul/2019:10:21:56.710416641 +1200] conn=583 op=13 RESULT err=0 tag=101 nentries=2 etime=0.0000488232 [18/Jul/2019:10:21:56.711367461 +1200] conn=583 op=14 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=1 filter="(objectClass=ipaConfigObject)" attrs="cn" [18/Jul/2019:10:21:56.711833608 +1200] conn=583 op=14 RESULT err=0 tag=101 nentries=2 etime=0.0000524228 [18/Jul/2019:10:21:56.713643579 +1200] conn=583 op=15 EXT oid="1.3.6.1.4.1.4203.1.11.3" name="whoami-plugin" [18/Jul/2019:10:21:56.713690341 +1200] conn=583 op=15 RESULT err=0 tag=120 nentries=0 etime=0.0000101013 [18/Jul/2019:10:21:56.714058200 +1200] conn=583 op=16 SRCH base="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs=ALL [18/Jul/2019:10:21:56.715729610 +1200] conn=583 op=16 RESULT err=0 tag=101 nentries=1 etime=0.0001727481 [18/Jul/2019:10:21:56.718868186 +1200] conn=583 op=17 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(&(objectClass=ipaConfigObject)(cn=DNS))" attrs=ALL [18/Jul/2019:10:21:56.718989678 +1200] conn=583 op=17 RESULT err=0 tag=101 nentries=0 etime=0.0000188568 [18/Jul/2019:10:21:56.719877244 +1200] conn=583 op=18 SRCH base="cn=domain.nz,cn=ad,cn=etc,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs="ipaNTFallbackPrimaryGroup ipaNTDomainGUID ipaNTSecurityIdentifier ipaNTFlatName cn" [18/Jul/2019:10:21:56.720092858 +1200] conn=583 op=18 RESULT err=32 tag=101 nentries=0 etime=0.0000273232 [18/Jul/2019:10:21:56.720879107 +1200] conn=583 op=19 SRCH base="cn=Domain Level,cn=ipa,cn=etc,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs="ipaDomainLevel" [18/Jul/2019:10:21:56.721086262 +1200] conn=583 op=19 RESULT err=0 tag=101 nentries=1 etime=0.0000261847 [18/Jul/2019:10:21:56.722073309 +1200] conn=583 op=20 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(&(objectClass=ipaConfigObject)(cn=CA))" attrs=ALL [18/Jul/2019:10:21:56.722563885 +1200] conn=583 op=20 RESULT err=0 tag=101 nentries=1 etime=0.0000563697 [18/Jul/2019:10:21:56.723796927 +1200] conn=583 op=21 SRCH base="cn=masters,cn=ipa,cn=etc,dc=domain,dc=nz" scope=2 filter="(&(objectClass=ipaConfigObject)(cn=KRA))" attrs=ALL [18/Jul/2019:10:21:56.723897525 +1200] conn=583 op=21 RESULT err=0 tag=101 nentries=0 etime=0.0000158808 [18/Jul/2019:10:21:56.728927145 +1200] conn=583 op=22 UNBIND [18/Jul/2019:10:21:56.728942256 +1200] conn=583 op=22 fd=105 closed - U1 [18/Jul/2019:10:21:56.830427620 +1200] conn=584 fd=105 slot=105 connection from 172.30.2.21 to 172.30.2.21 [18/Jul/2019:10:21:56.832717397 +1200] conn=584 op=0 BIND dn="" method=sasl version=3 mech=GSS-SPNEGO [18/Jul/2019:10:21:56.834168014 +1200] conn=584 op=0 RESULT err=0 tag=97 nentries=0 etime=0.0001598537 dn="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" [18/Jul/2019:10:21:56.835656032 +1200] conn=584 op=1 SRCH base="cn=ipaconfig,cn=etc,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs=ALL [18/Jul/2019:10:21:56.836531899 +1200] conn=584 op=1 RESULT err=0 tag=101 nentries=1 etime=0.0000956733 [18/Jul/2019:10:21:56.837870697 +1200] conn=584 op=2 SRCH base="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs="distinguishedName" [18/Jul/2019:10:21:56.838107132 +1200] conn=584 op=2 RESULT err=0 tag=101 nentries=1 etime=0.0000295050 [18/Jul/2019:10:21:56.838763396 +1200] conn=584 op=3 SRCH base="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs="telephoneNumber uid krbCanonicalName ipatokenRadiusUserName ipaUserAuthType krbPrincipalExpiration homeDirectory nsAccountLock usercertificate;binary title loginShell * uidNumber mail ipaCertMapData memberOf memberofindirect krbPrincipalName givenName gidNumber sn ou userClass ipatokenRadiusConfigLink aci" [18/Jul/2019:10:21:56.840471566 +1200] conn=584 op=3 RESULT err=0 tag=101 nentries=1 etime=0.0001794160 [18/Jul/2019:10:21:56.841591391 +1200] conn=585 fd=115 slot=115 connection from 172.30.2.21 to 172.30.2.21 [18/Jul/2019:10:21:56.841875245 +1200] conn=584 op=4 SRCH base="dc=domain,dc=nz" scope=2 filter="(|(member=uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz)(memberUser=uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz)(memberHost=uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz))" attrs="" [18/Jul/2019:10:21:56.842518705 +1200] conn=584 op=4 RESULT err=0 tag=101 nentries=3 etime=0.0000712599 notes=P pr_idx=0 pr_cookie=-1 [18/Jul/2019:10:21:56.843442959 +1200] conn=584 op=5 SRCH base="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" scope=0 filter="(userPassword=*)" attrs="userPassword" [18/Jul/2019:10:21:56.843725735 +1200] conn=584 op=5 RESULT err=0 tag=101 nentries=1 etime=0.0000390450 [18/Jul/2019:10:21:56.844257371 +1200] conn=584 op=6 SRCH base="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" scope=0 filter="(krbPrincipalKey=*)" attrs="krbPrincipalKey" [18/Jul/2019:10:21:56.844555395 +1200] conn=584 op=6 RESULT err=0 tag=101 nentries=1 etime=0.0000355189 [18/Jul/2019:10:21:56.846600138 +1200] conn=585 op=0 BIND dn="" method=sasl version=3 mech=GSS-SPNEGO [18/Jul/2019:10:21:56.847912921 +1200] conn=586 fd=116 slot=116 connection from 172.30.2.21 to 172.30.2.21 [18/Jul/2019:10:21:56.847999855 +1200] conn=585 op=0 RESULT err=0 tag=97 nentries=0 etime=0.0001535869 dn="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" [18/Jul/2019:10:21:56.849786211 +1200] conn=586 op=0 BIND dn="" method=sasl version=3 mech=GSS-SPNEGO [18/Jul/2019:10:21:56.851164107 +1200] conn=586 op=0 RESULT err=0 tag=97 nentries=0 etime=0.0001510374 dn="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" [18/Jul/2019:10:21:56.852626523 +1200] conn=584 op=7 UNBIND [18/Jul/2019:10:21:56.852642659 +1200] conn=584 op=7 fd=105 closed - U1 [18/Jul/2019:10:21:56.941411799 +1200] conn=585 op=1 SRCH base="cn=ipaconfig,cn=etc,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs=ALL [18/Jul/2019:10:21:56.942275498 +1200] conn=585 op=1 RESULT err=0 tag=101 nentries=1 etime=0.0000956579 [18/Jul/2019:10:21:57.152672440 +1200] conn=585 op=2 UNBIND [18/Jul/2019:10:21:57.152700335 +1200] conn=585 op=2 fd=115 closed - U1 [18/Jul/2019:10:21:58.398652311 +1200] conn=586 op=1 UNBIND [18/Jul/2019:10:21:58.398679927 +1200] conn=586 op=1 fd=116 closed - U1 [18/Jul/2019:10:21:59.048701032 +1200] conn=587 fd=105 slot=105 connection from 172.30.2.21 to 172.30.2.21 [18/Jul/2019:10:21:59.050977127 +1200] conn=587 op=0 BIND dn="" method=sasl version=3 mech=GSS-SPNEGO [18/Jul/2019:10:21:59.052787349 +1200] conn=587 op=0 RESULT err=0 tag=97 nentries=0 etime=0.0002020278 dn="uid=yusuf,cn=users,cn=accounts,dc=domain,dc=nz" [18/Jul/2019:10:21:59.055142264 +1200] conn=587 op=1 SRCH base="cn=ipaconfig,cn=etc,dc=domain,dc=nz" scope=0 filter="(objectClass=*)" attrs=ALL [18/Jul/2019:10:21:59.055997890 +1200] conn=587 op=1 RESULT err=0 tag=101 nentries=1 etime=0.0000923790 [18/Jul/2019:10:21:59.057469066 +1200] conn=587 op=2 SRCH base="cn=users,cn=accounts,dc=domain,dc=nz" scope=1 filter="(objectClass=posixaccount)" attrs="ipaSshPubKey uid" [18/Jul/2019:10:21:59.059974320 +1200] conn=587 op=2 RESULT err=0 tag=101 nentries=11 etime=0.0002589671 [18/Jul/2019:10:21:59.063797326 +1200] conn=587 op=3 UNBIND [18/Jul/2019:10:21:59.063813734 +1200] conn=587 op=3 fd=105 closed - U1 [18/Jul/2019:10:22:09.973091530 +1200] conn=581 op=8 SRCH base="cn=accounts,dc=domain,dc=nz" scope=2 filter="(&(uid=mailer-daemon)(objectClass=posixAccount)(uid=*)(&(uidNumber=*)(!(uidNumber=0))))" attrs="objectClass uid userPassword uidNumber gidNumber gecos homeDirectory loginShell krbPrincipalName cn memberOf ipaUniqueID ipaNTSecurityIdentifier modifyTimestamp entryusn shadowLastChange shadowMin shadowMax shadowWarning shadowInactive shadowExpire shadowFlag krbLastPwdChange krbPasswordExpiration pwdattribute authorizedService accountexpires useraccountcontrol nsAccountLock host logindisabled loginexpirationtime loginallowedtimemap ipaSshPubKey ipaUserAuthType usercertificate;binary mail" [18/Jul/2019:10:22:09.973358086 +1200] conn=581 op=8 RESULT err=0 tag=101 nentries=0 etime=0.0000443012 [18/Jul/2019:10:22:33.376536162 +1200] conn=12 op=689 MOD dn="cn=MasterCRL,ou=crlIssuingPoints,ou=ca,o=ipaca" [18/Jul/2019:10:22:33.377910138 +1200] conn=12 op=689 RESULT err=0 tag=103 nentries=0 etime=0.0001508058 [18/Jul/2019:10:22:33.740188105 +1200] conn=21 op=438 SRCH base="ou=sessions,ou=Security Domain,o=ipaca" scope=2 filter="(objectClass=securityDomainSessionEntry)" attrs="cn" [18/Jul/2019:10:22:33.740362398 +1200] conn=21 op=438 RESULT err=32 tag=101 nentries=0 etime=0.0000273265 [18/Jul/2019:10:22:33.806163157 +1200] conn=588 fd=105 slot=105 connection from 172.30.3.21 to 172.30.2.21 [18/Jul/2019:10:22:33.806692050 +1200] conn=588 op=0 BIND dn="" method=sasl version=3 mech=GSSAPI [18/Jul/2019:10:22:33.809154382 +1200] conn=588 op=0 RESULT err=14 tag=97 nentries=0 etime=0.0002637408, SASL bind in progress [18/Jul/2019:10:22:33.809715142 +1200] conn=588 op=1 BIND dn="" method=sasl version=3 mech=GSSAPI [18/Jul/2019:10:22:33.810987188 +1200] conn=588 op=1 RESULT err=14 tag=97 nentries=0 etime=0.0001307738, SASL bind in progress [18/Jul/2019:10:22:33.811419905 +1200] conn=588 op=2 BIND dn="" method=sasl version=3 mech=GSSAPI [18/Jul/2019:10:22:33.812018971 +1200] conn=588 op=2 RESULT err=0 tag=97 nentries=0 etime=0.0000635169 dn="krbprincipalname=ldap/intauth-w.domain.nz@domain.nz,cn=services,cn=accounts,dc=domain,dc=nz" [18/Jul/2019:10:22:33.812506463 +1200] conn=588 op=3 SRCH base="" scope=0 filter="(objectClass=*)" attrs="supportedControl supportedExtension" [18/Jul/2019:10:22:33.813700412 +1200] conn=588 op=3 RESULT err=0 tag=101 nentries=1 etime=0.0001272735 [18/Jul/2019:10:22:33.814259613 +1200] conn=588 op=4 SRCH base="" scope=0 filter="(objectClass=*)" attrs="supportedControl supportedExtension" [18/Jul/2019:10:22:33.815425899 +1200] conn=588 op=4 RESULT err=0 tag=101 nentries=1 etime=0.0001220905 [18/Jul/2019:10:22:33.816031871 +1200] conn=588 op=5 EXT oid="2.16.840.1.113730.3.5.12" name="replication-multimaster-extop" [18/Jul/2019:10:22:33.816449793 +1200] conn=588 op=5 RESULT err=0 tag=120 nentries=0 etime=0.0000465534 [18/Jul/2019:10:22:33.818423321 +1200] conn=588 op=6 EXT oid="2.16.840.1.113730.3.5.5" name="replication-multimaster-extop" [18/Jul/2019:10:22:33.819035963 +1200] conn=588 op=6 RESULT err=0 tag=120 nentries=0 etime=0.0000648457