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Topic: Dovecot no fields error

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.5.1 (migration)
- Deployed with iRedMail Easy or the downloadable installer? download
- Linux/BSD distribution name and version:  Debian 11
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? not yet
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: Loading modules from directory: /usr/lib/dovecot/modules
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: Loading modules from directory: /usr/lib/dovecot/modules
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib01_acl_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib01_acl_plugin.so
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib10_quota_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib10_quota_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib15_notify_plugin.so
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib15_notify_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib20_mail_log_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib20_mailbox_alias_plugin.so
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib20_mail_log_plugin.so
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib20_mailbox_alias_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib90_sieve_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: auth-master: userdb lookup(postmaster@umfcorp.com): Started userdb lookup
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: auth-master: conn unix:/run/dovecot/auth-userdb: Connecting
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: Module loaded: /usr/lib/dovecot/modules/lib90_sieve_plugin.so
Feb 03 15:05:02 newmail dovecot[412180]: lda(postmaster@umfcorp.com)<412180><>: Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=407190,uid=0): Client connected (fd=9)
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: auth-master: userdb lookup(postmaster@umfcorp.com): Started userdb lookup
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: auth-master: conn unix:/run/dovecot/auth-userdb: Connecting
Feb 03 15:05:02 newmail dovecot[412181]: lda(postmaster@umfcorp.com)<412181><>: Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=407190,uid=0): Client connected (fd=9)
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: master in: USER        1        postmaster@umfcorp.com        service=lda
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): Performing userdb lookup
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): user search: base=o=domains,dc=ultraimage,dc=us scope=subtree filter=(&(objectClass=mailUser)(accou>
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: master in: USER        1        postmaster@umfcorp.com        service=lda
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): Performing userdb lookup
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): user search: base=o=domains,dc=ultraimage,dc=us scope=subtree filter=(&(objectClass=mailUser)(accou>
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): no fields returned by the server
Feb 03 15:05:02 newmail dovecot[407195]: auth: ldap(postmaster@umfcorp.com): unknown user
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): Finished userdb lookup
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: userdb out: NOTFOUND        1
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): no fields returned by the server
Feb 03 15:05:02 newmail dovecot[407195]: auth: ldap(postmaster@umfcorp.com): unknown user
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: ldap(postmaster@umfcorp.com): Finished userdb lookup
Feb 03 15:05:02 newmail dovecot[407195]: auth: Debug: userdb out: NOTFOUND        1

we're in the process of migrating from 0.9.8 to the latest release by way of creating a new server and migrating the LDAP and data. we're also migrating from roundcube to SoGo, so i have not migrated sieve.
dovecot seems to be having issues reading from the LDAP. iredadmin seems to work fine.

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Re: Dovecot no fields error

Please read our tutorial carefully, you need to update LDAP schema file and data:
https://docs.iredmail.org/migrate.to.ne … erver.html