View source for WAN CONCEPTS Full backups failing

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=Error : "Missing account list" while running full backup=
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{{KB|{{ZC}}|{{ZCS 8.7}}||||}} 
{{WIP}}  

====Problem: ====

Following error appears when a full backup is executed :
 /opt/zimbra/bin/zmbackup -f - all 
 Error occurred: invalid request: Missing account list .</p>

Following error is observed in /opt/zimbra/log/mailbox.log file :
 Error occurred: invalid request: Missing account list
 class=com.zimbra.common.soap.SoapFaultException
 message=invalid request: Missing account list
 isReceiversFault=false
 mIsLocal=false
 mDetail=<soapetail><Error xmlns="urn:zimbra"><Code>service.INVALID_REQUEST</Code><Trace>qtp509886383-7512:https://127.0.0.1:7071/service/admin/soap/BackupRequest:1440585474466:7971caa86fd4f1d9</Trace></Error></soapetail>
 mFault=<soap:Fault><soap:Code><soap:Value>soap:Sender</soap:Value></soap:Code><soap:Reason><soap:Text>invalid request: Missing account list</soap:Text></soap:Reason><soapetail><Error xmlns="urn:zimbra"><Code>service.INVALID_REQUEST</Code><Trace>qtp509886383-7512:https://127.0.0.1:7071/service/admin/soap/BackupRequest:1440585474466:7971caa86fd4f1d9</Trace></Error></soapetail></soap:Fault>

====Solution====
This issue is seen when the /opt/zimbra/backup/accounts.xml file is missing or corrupt, it makes the new backup unable to read the previous backup entry. 
Move the old sessions directory and corrupt accounts.xml file to resolve this issue using the given steps :

 su - zimbra 
 cd /opt/zimbra/backup 
 mv sessions sessions.OLD 
 mv accounts.xml accounts.xml.OLD

Verify the solution by taking a full backup again -
 
 /opt/zimbra/bin/zmbackup -f -a all

{{SubmittedBy|  Sourabh Bhushan}}


{{Article Footer|ZCS 8.8|2020-04-13}}