Zimbra Admin Panel Black not showing

IF zimbra Admin Panel not work/blank-page then check bellow three steps.

https://zimbra.tayabkhan.com:7071/zimbraAdmin/

1) check all services
su - zimbra
zmcontrol status

If any service stop, then up accordingly

2) Check https certificate (either date expired or not) from browser
if expired then


/opt/zimbra/bin/zmcertmgr createca -new

/opt/zimbra/bin/zmcertmgr createcrt -new -days 365

/opt/zimbra/bin/zmcertmgr deploycrt self

/opt/zimbra/bin/zmcertmgr deployca

----------------------

Also Check:
zmmailbox -z -m admin@tyabkhan.com gaf
zmprov fc all

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


3) Finally refresh /opt/zimbra/jetty/webapps/zimbraAdmin directory

Goto a new fresh same version Zimbra server and copy zimbraAdmin directory and past to faulty server.

cd /opt/zimbra/jetty/webapps/
tar -czvf zmadmin.tar.gz zimbraAdmin/
cp zmadmin.tar.gz and put faulty server and nutar by removing old directory