CentOS 7.x Zimbra webpage showing blank or Zimbra CPU usage very high due to malware issue resolution

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Fix permissions

There are several reasons why Zimbra web-page can be blank. If it is due to permissions fix it using:

/opt/zimbra/libexec/zmfixperms

Refer:

• https://lorenzo.mile.si/zimbra-blank-broken-login/1033/

Enable services

Make sure services required to display webpage are enabled:

zmprov ms `zmhostname` +zimbraServiceEnabled service
zmprov ms `zmhostname` +zimbraServiceEnabled zimbra
zmprov ms `zmhostname` +zimbraServiceEnabled zimbraAdmin
zmprov ms `zmhostname` +zimbraServiceEnabled zimlet
zmcontrol restart

Refer:

• https://wiki.zimbra.com/wiki/Zimbra_Admin_and_Web_Client_not_load,_it_is_blank

Patch Zimbra

In a few cases with Zimbra 8.6 it was found that machine was comproimsed and hence pages were blank. Also in a few of this cases the attacker ran malware on Zimbra server that led to very high CPU usage, SPAM issues, mail not getting delivered due to IP blacklisting, etc. In such cases use:

For Zimbra 8.6 install patch 14

1. For installing patch go to Zimbra downloads and for the related version download latest patch.
2. Extract downloaded patch as root user and install it from root user
3. Restart zimbra.

Refer:

• http://prolinuxhub.com/zimbra-collaboration-8-8-blank-screen-after-install/

So far above steps have worked so remaining steps suggested later have not been tried.

Overwrite webserver files

Install zimbra elsewhere and overwrite jetty/webapps Refer:

• https://serverfault.com/questions/750491/zimbra-admin-page-white-screen

Validate /etc/hosts and hostname

May be issue with /etc/hosts and hostname Refer:

• https://it.toolbox.com/question/zimbra-admin-cannot-open-in-web-browser-090712

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