syncrepl provider not working after upgrade to 2.4.26

Hi, I have a syncrepl provider v2.4.22 working fine (the only provider in our organization). I upgraded with the same configuration to v2.4.26 and provider is not working (neither over ldaps: nor over ldap:). Otherwise connectivity is fine (with any ldap client) both with ldap and with ldaps. I get (in all consumers): Oct 17 21:21:32 vmail slapd[14621]: do_syncrep2: rid=111 LDAP_RES_SEARCH_RESULT Oct 17 21:21:32 vmail slapd[14621]: do_syncrep2: rid=111 LDAP_RES_SEARCH_RESULT (53) Server is unwilling to perform Oct 17 21:21:32 vmail slapd[14621]: do_syncrep2: rid=111 (53) Server is unwilling to perform Oct 17 21:21:32 vmail slapd[14621]: do_syncrepl: rid=111 rc -2 retrying How can I troubleshoot the issue further? Current config on the provider is: overlay syncprov syncprov-checkpoint 100 10 syncprov-sessionlog 100 and on consumers: syncrepl rid=111 provider=ldaps://ldap.example.com tls_reqcert=never type=refreshAndPersist retry="60 +" searchbase="dc=example,dc=com" schemachecking=off bindmethod=simple binddn="cn=someuser,dc=example,dc=com" credentials="password" Thanks, Nick