Zimbra Chat Problem

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Problem:
Continuous notification of below message:
Unknown command sent to server. ZxChatRequest
Solution:

 #mv /opt/zimbra/lib/ext/openchat/zal.jar /tmp
#cp -rp /opt/zimbra/lib/ext/zimbradrive/zal.jar /opt/zimbra/lib/ext/openchat/zal.jar
#su - zimbra
$zmmailboxdctl restart

 Ref:

 https://forums.zimbra.org/viewtopic.php?t=67565#p295423

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