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Event ID: 12019 Source: MSExchangeTransport

Level
Description
The remote internal transport certificate expired. Certificate subject: CN=(FQDN of SERVER)
Comments
 
The certificate used for secure mail flow between internal Exchange servers has expired and needs to be renewed. In my case the Edge servers certificate had expired requiring me to renew the certificate then re-subscribe the edge server to my hub server. See EV100022.

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