sorry for opening new thread, but this is driving me crazy.
After migrating from Ubuntu 12.04 to Ubuntu 14.04 and upgrading afterwards ZCS 8.0.9 to ZCS 8.8.6, I get strange issues.
Clients work OK for few days, then all of the sudden they report cannot access IMAP or POP3 mail with mail client. Then agin it works for some time, and refueses again.
Might it be some Split-DNS issue, like internally resolving to publicDNS then after cache expired resolving internally? Or vice versa?
Or some Firewall issue? On Ubuntu itself I have Firewall disabled. There's pfSense in front of ZCS, but shows no blocked evens in monitroed time slot.
Ideas welcome!
Code: Select all
-- Connection OK --
nginx.log
2018/02/23 07:46:36 [info] 3013#0: *139135 client <clientIP>:41624 connected to 0.0.0.0:993
2018/02/23 07:46:36 [info] 3013#0: *139135 client logged in, client: <clientIP>:41624, server: 0.0.0.0:993, login: "<client@email>", upstream: 10.10.11.50:7143 (<clientIP>:41624->10.10.11.50:993) <=> (10.10.11.50:52824->10.10.11.50:7143)
mailbox.log
2018-02-23 07:46:36,752 INFO [ImapServer-70] [ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - ID elapsed=1
2018-02-23 07:46:36,753 INFO [ImapServer-70] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - user <client@email> authenticated, mechanism=LOGIN
2018-02-23 07:46:36,753 INFO [ImapServer-70] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - LOGIN elapsed=1
2018-02-23 07:46:36,803 INFO [ImapServer-64] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - NAMESPACE elapsed=0
2018-02-23 07:46:36,837 INFO [ImapServer-69] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - ENABLE elapsed=0
2018-02-23 07:46:36,874 INFO [ImapServer-64] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - ENABLE elapsed=0
2018-02-23 07:46:36,925 INFO [ImapServer-64] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - copying message data from existing session: INBOX
2018-02-23 07:46:36,926 INFO [ImapServer-64] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - selected folder INBOX
2018-02-23 07:46:36,929 INFO [ImapServer-64] [name=<client@email>;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - SELECT elapsed=11
-- Connection FAILED --
nginx.log
2018/02/23 08:02:52 [info] 3013#0: *139135 proxied session done, client: <clientIP>:41624, server: 0.0.0.0:993, login: "<client@email>", upstream: 10.10.11.50:7143 (->10.10.11.50:993) <=> (10.10.11.50:52824->10.10.11.50:7143)
2018/02/23 08:02:52 [info] 3013#0: *139135 SSL_write() failed (SSL:) (32: Broken pipe) while proxying, client: <clientIP>:41624, server: 0.0.0.0:993, login: "<client@email>", upstream: 10.10.11.50:7143 (->10.10.11.50:993) <=> (->)
mailbox.log
2018-02-23 08:01:31,762 INFO [ImapServer-70] [name=<client@email>;mid=696;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - NOOP elapsed=0
2018-02-23 08:01:31,796 INFO [ImapServer-69] [name=<client@email>;mid=696;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - copying message data from existing session: INBOX
2018-02-23 08:01:31,797 INFO [ImapServer-69] [name=<client@email>;mid=696;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - selected folder INBOX
2018-02-23 08:01:31,802 INFO [ImapServer-69] [name=<client@email>;mid=696;ip=10.10.11.50;oip=<clientIP>;via=com.samsung.android.email.provider,10.10.11.50(nginx/1.7.1);ua=Zimbra/8.8.6_GA_1906;] imap - SELECT elapsed=10