Steps to fix folder list problem in webclient

---

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 or not 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

Submitted by: Heera Singh Koranga