Modern UI is not accessible

Modern UI is not accessible

   KB 24112        Last updated on 2022-08-13  

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Modern UI is not accessible directly or its fall back to classic UI when clicking on Modern Web App.


Following are the possible solutions to fix this issue.

Scenario 1

Try to reinstall "zimbra-timezone-data" package.


yum reinstall zimbra-timezone-data -y 
su - zimbra
zmmailboxdctl restart


apt install --reinstall zimbra-timezone-data
su - zimbra
zmmailboxdctl restart

If ModernUI is still not loading then collect the browser debug logs (https://web_client_url/?dev=1) along with server logs and share with Zimbra Support for furtehr troubleshooting.

  1. /opt/zimbra/log/mailbox.log
  2. /opt/zimbra/log/zmmailboxd.out
  3. latest install.log from /tmp/ [if available]
  4. latest zmsetup.log (under /opt/zimbra/log)
  5. Output of "rpm -qa" or "dpkg -l"
Scenario 2

The value of an attribute zimbraFileUploadMaxSize can also cause this issue as Int cannot represent non 32-bit signed integer value "21474836480" while loading the modern UI.

Make the following changes :

su - zimbra
zmprov ms `zmhostname` zimbraFileUploadMaxSize 21474836480

Now access the Modern UI.

Scenario 3

The partial upgrade can cause the issue. To verify it, check /opt/zimbra/log/ and /opt/zimbra/.install_history files.

Scenario 4
32220#0: *1432131 connect() failed (111: Connection refused) while connecting to upstream, client:, server:, request: "GET /js/ajax/3rdparty/tinymce/themes/modern/theme_min.js?v=220324061927 HTTP/1.1", upstream: "", host: "", referrer: ""
Re-install below packages.
apt-get --reinstall zimbra-modern-ui zimbra-modern-zimlets zimbra-patch
yum reinstall zimbra-modern-ui zimbra-modern-zimlets zimbra-patch
If reinstallation of the above packages didn't help, then stop all the services and rerun installer to update all the dependent packages.
[run as zimbra] [su - zimbra]
zmcontrol stop
[run as root]
[run as zimbra]
zmcontrol restart
Submitted by: Krishna M. Bhosale
Verified Against: ZCS 9.0 Date Created: 2020-06-24
Article ID: Date Modified: 2022-08-13

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