Difference between revisions of "Troubleshooting Course Content Rough Drafts-Zimbra Logs"

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* Amavisd debug logging - Controlled by zimbra attribute "zimbraAmavisLogLevel", which writes value of "$log_level" in file /opt/zimbra/conf/amavisd.conf
* Amavisd debug logging - Controlled by zimbra attribute "zimbraAmavisLogLevel", which writes value of "$log_level" in file /opt/zimbra/conf/amavisd.conf
* Valid range is 0-5, defaults to 1.  
* Typically required when trying to identify issues -
** Amavis causing delay in scanning a message
** Domain disclaimer not working as expected
** Amavis causing disruption in mail flow
* Logging level - 0-5, where 5 represents maximum debug logging. Value defaults to 1.  
  zmprov mcf zimbraAmavisLogLevel 5
  zmprov mcf zimbraAmavisLogLevel 5

Revision as of 11:04, 9 March 2015


Verified Against: Zimbra Collaboration Suite 8.6 Date Created: 01/22/2015
Article ID: https://wiki.zimbra.com/index.php?title=Troubleshooting_Course_Content_Rough_Drafts-Zimbra_Logs Date Modified: 2015-03-09

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Log Files

Brief list of the major log files in Zimbra and their significance.

  • /opt/zimbra/log/mailbox.log - Zimbra Mailboxd (jetty) writes all mailbox activity to this log file. This activity can be anything from moving a message to deletion of an account.
  • /opt/zimbra/log/zmmailboxd.out – Mailboxd(jetty) logs to this file during startup.
  • /opt/zimbra/log/audit.log – Logs authentication activity.
  • /opt/zimbra/log/sync.log – Mobile sync operations get logged to this log file.
  • /opt/zimbra/log/clamd.log – Clamd (Antivirus daemon) logs all antivirus activity to this file.
  • /opt/zimbra/log/freshclam.log – Antivirus definition update.
  • /opt/zimbra/log/mysql_error.log – Mysql errors and startup messages. This log should be looked up to determine if innodb corruption has occurred.
  • /opt/zimbra/log/myslow.log – Consists sql statements which took more than long_query_time seconds (zimbra default – 1second) to execute and required atleast min_examined_row_limit (zimbra default - 0) rows to be examined.
  • /opt/zimbra/log/nginx.access.log - NGINX writes information about client requests after the request is processed.
  • /opt/zimbra/log/nginx.log – Nginx error log which defaults to “info” in Zimbra.
  • /opt/zimbra/log/spamtrain.log – Spam training log.
  • /opt/zimbra/log/ews.log – EWS server side activity.
  • /var/log/zimbra.log – All MTA (Postfix, amavisd, antispam, antivirus,cyrus-sasl)/Ldap logs go to this file.
  • /var/log/zimbra-stats.log – Logger data gets logged to this file.

Log Rotation

Two different log rotation daemons handle log rotation of the zimbra log files.

  • Log4j - Log4j is responsible for logging to mailbox.log, audit.log, sync.log, synctrace.log,webxml.log and ews.log. For config : /opt/zimbra/conf/log4j.properties

Example, below the are the config options for the rotation of /opt/zimbra/log/mailbox.log

log4j.appender.LOGFILE.layout.ConversionPattern=%d %-5p [%t] [%z] %c{1} - %m%n
  • Logrotate.d - The OS daemon logrotate used to rotate other log files.
Config file : /etc/logrotate.d/zimbra 

Files rotated by logrotate : zimbra.log, zimbra-stats.log, myslow.log, zmconfigd.log, zmconfigd.log, clamd.log, freshclam.log, nginx.log, nginx_access.log, cbpolicyd.log and spamtrain.log.

Debug Logging


The ZCS server uses log4j, a Java logging package as the log manager

  • By default, the ZC server has log4j configured to log to the local file system
  • Global debug logging : Doing this will enable debug logging for any log4j property.
Edit - /opt/zimbra/conf/log4j.properties.in
Restart mailboxd – zmmailboxdctl restart
  • Per user debug logging (does not requires mailboxd restart) :
addAccountLogger : zmprov aal user@domain.com zimbra.imap debug
removeAccountLogger : zmprov ral user@domain.com zimbra.imap
  • Debug logs for mailbox required when troubleshooting a specific problem with the mailbox component, for example
Trying to add an appointment but not happening
Specific message not getting delivered
Specific user unable to log into his acocunt using web/imap/pop etc.
Unable to download specific message using imap/pop or activesync

  • Each component of mailboxd has a control to increase logging for that specific component. These are known as loggers, To list all possible loggers -
zmprov help log
  • Debug logs for mailbox get written to /opt/zimbra/log/mailbox.log, /opt/zimbra/log/ews.log for ews, /opt/zimbra/log/sync.log for sync and /opt/zimbra/log/webxml.log for webxml.

Logging Levels Logging levels determine what types of events are logged. The following are logging levels in log4j:

  • WARN
  • INFO

The FATAL logging level will only log very severe error events. The DEBUG logging level will log detailed informational events useful for debugging purposes. Each additional logging level will log more events, including the events belonging to the previous logging levels. For example, enabling the WARN logging level will record log events belonging to the FATAL, ERROR, and WARN logging levels, but will not record events belonging to the INFO or DEBUG levels. By default, most predefined log4j categories in ZCS are set to the INFO logging level.

Protocol Trace Protocol trace is available in the following logging categories with TRACE logging level:

  • zimbra.smtp
  • zimbra.lmtp
  • zimbra.soap
  • zimbra.imap
  • zimbra.imap-client
  • zimbra.pop
  • zimbra.pop-client

  • Reference - [1]


  • Ldap debug logging – Controlled by “ldap_common_loglevel”, this writes the config ldap attribute "olcLogLevel".
  • Typically required when trying to troubleshoot a specific request which is taking time, or when there some weird scenario which is causing a specific replica sync to fail.

Examples -

 zmlocalconfig –e ldap_common_loglevel=256
 zmlocalconfig –e ldap_common_loglevel=“stats”
 Restart -  ldap stop; ldap start.  

For various log levels please see -

  • Debug logs written to /var/log/zimbra.log


  • Typically required when trying to troubleshoot email flow issues. For example specific mail getting dropped or getting stuck in the queue.
  • Edit /opt/zimbra/postfix/conf/master.cf.in
Change - smtp      inet  n       -       n       -       -       smtpd
To - smtp      inet  n       -       n       -       -       smtpd –vv

Restart of postfix required

zmmtactl restart
  • This will write debug postfix logs to /var/log/zimbra.log


  • Required when troubleshooting issues specific to spamassassin, for example a message being incorrectly dropped or spamassissin taking too long to scan emails.
  • Debug logging for SpamAssassin controlled by “zimbraAmavisSALogLevel”, this writes "sa_debug" to /opt/zimbra/conf/amavisd.conf.
  • Value can be 0 or 1(info or all)
zmprov mcf zimbraAmavisSALogLevel 1 
zmprov ms `zmhostname` zimbraAmavisSALogLevel 1 
  • Debug logs get written to /var/log/zimbra.log


  • Amavisd debug logging - Controlled by zimbra attribute "zimbraAmavisLogLevel", which writes value of "$log_level" in file /opt/zimbra/conf/amavisd.conf
  • Typically required when trying to identify issues -
    • Amavis causing delay in scanning a message
    • Domain disclaimer not working as expected
    • Amavis causing disruption in mail flow
  • Logging level - 0-5, where 5 represents maximum debug logging. Value defaults to 1.
zmprov mcf zimbraAmavisLogLevel 5
zmprov ms `zmhostname` "zimbraAmavisLogLevel" 5
  • This will write debug log to - /var/log/zimbra.log


  • Controlled by zimbra attribute zimbraReverseProxyLogLevel.
zmprov ms `zmhostname` zimbraReverseProxyLogLevel debug
zmnginxctl restart

It will log a lot, so you can set it back to info at any time:

 zmprov ms `zmhostname` zimbraReverseProxyLogLevel info
  • This will write debug logs to /opt/zimbra/log/nginx.log

ZCO Logs

  • For all but the simplest queries, ZCO Dev needs ZCO logs, dumps and event viewer logs. Here's how to gather them:
Disable Windows Search 
start->run->services->Windows Search->Properties->Stop + “Disabled” 
Start Outlook 
Disable Foreign Addins i.e. any addins that dont start with "Zimbra" 
OL2003: Tools->Options->Other->Advanced Options->COM Add-Ins->Remove any addins that don't start  with "Zimbra" 
OL2007: Tools->Trust Center->Add-ins->Manage COM Addins->Go->Untick any addins that don't start with "Zimbra" 
OL2010: File->Options->Add-ins->Manage COM Addins->Go->Untick any addins that don't start with "Zimbra" 
OL2013: as OL2010 
Close Outlook 
  • Empty ZCOLogs Directory (to avoid sending ZCO Dev stale/irrelevant logs)
  • Set Log Settings (using ZCOLogCtl.exe) to the following -
 Click the Default button 
 Max size of single log file : 50Mb 
 Preserve Log File Backups ticked 
 Max Size of ZCOLogs directory UNticked

ZCO Troubleshooting

  • Start Outlook + Repro the Issue
  • Take detailed notes of the steps
  • If possible, make a note of the time the problem ocurred
  • If the problem relates to a particular item, include its ZimbraID and/or Subject
  • Include Screen shots; Screen video if possible
  • Close Outlook. If Outlook hung, grab a Hang Dump:
  • Task Manager->Processes Tab->Right click OUTLOOK.EXE->Create Dump File
  • Export Outlook Events from the Windows Event Viewer:
  • Start Event Viewer
  • Select "Windows Logs" | Application from the left pane.
  • In Actions (right pane) select "Filter Current Log..."
  • In the Filter dialog select
  • select "Last 7 days" from the "Logged:" dropdown
  • check Outlook in the "Event sources:"
  • they will probably also need to limit output to the current "User:"
  • Click OK
  • Save with "Save Filtered Log File...", and pass us the resulting .evtx file
  • Check logs before sending to ZCO Dev
  • Must cover the repro period (note that each log file name includes the date and time at which a client session started)
  • Check for obvious issues (e.g. server unreachable)
## ERROR ## Usually indicates an unexpected problem 
## WARNING ## Usually benign but worth knowing 

Quiz Questions

  • Which log file(s) an ZC Administrator should review if there are reports that incoming mail has stopped.
  • You need to enable SOAP TRACE logging for user joe@xyz.com, what is the command needed to enable without the need of restarting service?
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