Hi,
I'm getting errors with my IMAP setup. Basically, everything seems to work. Mail is delivered nicely from Postfix to Dovecot via LMTP. Dovecot does the authentication to LDAP (also for Postfix). Users are able to send mail via authenticated submission (Postfix) and login into IMAP and POP.
However, IMAP connections are dropped frequently with an "ERROR: Connection dropped by IMAP server.". After pressing reload on the webmail, or refreshing in the client might help for a short period. So it fails intermittently.
The errors in the maillog are below. It seems to be mixing up users kind of randomly. I think when multiple connections are made at the same time. Did a lot of searching, put couldn't find an answer to this problem. All I can find is related to LDA, which I'm not using.
Any help would be appreciated.
Errors from the log:
Sep 28 00:03:24 mailserver dovecot: imap(userD)<14864><WT8DguF2MspUUoaT>:
Fatal: setgid(1012(userD) from userdb lookup) failed with
euid=1011(userA), gid=1011(userA), egid=1011(userA): Operation not
permitted (This binary should probably be called with process group set to
1012(userD) instead of 1011(userA))
Sep 28 00:03:24 mailserver dovecot: imap(userD)<17009><recJguF2NMpUUoaT>:
Fatal: setgid(1012(userD) from userdb lookup) failed with
euid=1011(userA), gid=1011(userA), egid=1011(userA): Operation not
permitted (This binary should probably be called with process group set to
1012(userD) instead of 1011(userA))
Sep 28 00:03:26 mailserver dovecot: imap(userD)<12807><8T0iguF2NspUUoaT>:
Fatal: setgid(1012(userD) from userdb lookup) failed with
euid=1011(userA), gid=1011(userA), egid=1011(userA): Operation not
permitted (This binary should probably be called with process group set to
1012(userD) instead of 1011(userA))
Sep 28 00:06:59 mailserver dovecot: imap(userD)<15661><UcfOjuF2OcpUUoaT>:
Fatal: setgid(1012(userD) from userdb lookup) failed with
euid=1011(userA), gid=1011(userA), egid=1011(userA): Operation not
permitted (This binary should probably be called with process group set to
1012(userD) instead of 1011(userA))
Sep 28 00:07:54 mailserver dovecot: imap(userA)<45614><NVkakuF2xO5UUoaT>:
Fatal: setgid(1011(userA) from userdb lookup) failed with
euid=1012(userD), gid=1012(userD), egid=1012(userD): Operation not
permitted (This binary should probably be called with process group set to
1011(userA) instead of 1012(userD))
Sep 28 00:08:08 mailserver dovecot: imap(userF)<45055>
# dovecot --version 2.3.2.1 (0719df592)
# 2.3.2.1 (0719df592): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.2 (7704de5e) # OS: FreeBSD 11.2-RELEASE amd64 # Hostname: callisto auth_cache_size = 10 M auth_debug = yes imap_idle_notify_interval = 29 mins mail_debug = yes mail_fsync = never mail_location = maildir:~/Maildir mail_plugins = " fts fts_solr" managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext namespace inbox { inbox = yes location = mailbox Archive { auto = subscribe special_use = \Archive } mailbox Drafts { auto = create special_use = \Drafts } mailbox Sent { auto = subscribe special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = / } passdb { args = /usr/local/etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { fts = solr fts_autoindex = yes fts_solr = url=http://127.0.0.1:8983/solr/dovecot/ recipient_delimiter = + sieve = file:~/sieve;active=~/.dovecot.sieve sieve_after = /usr/local/etc/dovecot/sieve-after.d sieve_before = /usr/local/etc/dovecot/sieve-before.d sieve_quota_max_storage = 50M } protocols = imap pop3 lmtp sieve service auth { client_limit = 1600 unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { inet_listener imap { address = 127.0.0.1, ::1 } process_min_avail = 3 service_count = 1 } service imap { process_min_avail = 3 service_count = 256 } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service pop3-login { inet_listener pop3 { address = 127.0.0.1, ::1 } service_count = 1 } ssl = required ssl_cert =
In /usr/local/etc/dovecot/dovecot-ldap.conf.ext: hosts = localhost dn = cn=reader,ou=Roles,dc=example,dc=com dnpass = secretpassword auth_bind = yes base = ou=People,dc=example,dc=com deref = never scope = subtree user_attrs = uid=uid,homeDirectory=home,uidNumber=uid,gidNumber=gid user_filter = (&(objectClass=posixAccount)(uid=%n)) pass_attrs = uid=user,userPassword=password pass_filter = (&(objectClass=posixAccount)(uid=%u)) default_pass_scheme = SSHA
dovecot-ldap-user.conf.ext is the same as dovecot-ldap.conf.ext
# freebsd-version 11.2-RELEASE-p3
Everything is installed from ports.