Mail-flow from office365 to on-premise Exchange disrupted in o365 hybrid setup after certificate renew.
Recently we had to renew the certificates in our exchange hybrid environment, which we did successfully but once the old cert expired our mail-flow from o365 to exchange disrupted, when we investigated we found that, o365 still seeing the old cert.
so to fix this issue we had to run the hybrid setup wizard again.
you can download the hybrid setup from "aka.ms/hybridwizard" and run the hybrid setup again,
this can be run from any machine which can reach both Office365 and Exchange, use Global Admin account, this will not disrupt or change any other settings, you can just select the new cert and finish the wizard.
Once the wizard if finished restart the transport service on hybrid servers.
so to fix this issue we had to run the hybrid setup wizard again.
you can download the hybrid setup from "aka.ms/hybridwizard" and run the hybrid setup again,
this can be run from any machine which can reach both Office365 and Exchange, use Global Admin account, this will not disrupt or change any other settings, you can just select the new cert and finish the wizard.
Once the wizard if finished restart the transport service on hybrid servers.
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