Steps to fix folder list problem in webclient

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Problem:

On ZCS v8.5.x and higher versions folder list is not visible in left panel of webclient.

Solution:

Check if all mailbox servers are listed in the zimbraReverseProxyAvailableLookupTargets.

Also, check zimbraMailReferMode must be set to "reverse-proxied" for all mailboxes.

Since ZCS v8.0.x attribtue zimbraReverseProxyAvailableLookupTargets overrides the old attribute zimbraReverseProxyLookupTarget

If zimbraReverseProxyAvailableLookupTargets is empty then proxy will use those mailbox servers for lookup which are having zimbraReverseProxyLookupTarget=TRUE

1). To fix this problem add all mailbox servers to the zimbraReverseProxyAvailableLookupTargets and set zimbraMailReferMode to "reverse-proxied".

zmprov mcf +zimbraReverseProxyAvailableLookupTargets <mailbox server>  
zmprov mcf zimbraMailReferMode reverse-proxied 

2). Now restart mailbox service and proxy service to take changes.

zmmailboxdctl restart  
zmproxyctl restart

The idea here is to find the mailbox where the affected user is and add it to zimbraReverseProxyAvailableLookupTargets if it has some value and if it is empty set zimbraReverseProxyLookupTarget to TRUE on that mailbox node.

Submitted by: Heera Singh Koranga