troubleshooting Question

Exchange Migration to Exchange online

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CHI-LTDFlag for United Kingdom of Great Britain and Northern Ireland asked on
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Hello

We have recently migrated our firewalls and wondering if this is the cause of not being able to migrate our on premise mailboxes to exchange online?

Current error:
The Mailbox Replication Service could not connect to the remote server because the certificate is invalid. The call to'https://mail.domain.uk/EWS/mrsproxy.svc' failed. Error details:Could not establish trust relationship for the SSL/TLS secure channel withauthority 'mail.domain.uk'. --> Thenderlying connection was closed:Could not establish trust relationship for the SSL/TLS secure channel. --> Theremote certificate is invalid according to the validation procedure.. -->Could not establish trust relationship for the SSL/TLS secure channel withauthority 'mail.domain.uk'. --> The underlying connection was closed:Could not establish trust relationship for the SSL/TLS secure channel. --> Theremote certificate is invalid according to the validation procedure.    + CategoryInfo          : NotSpecified: (:) [New-MoveRequest], MRSRemotePe   rmanentException    + FullyQualifiedErrorId : [Server=EXO,RequestId=249d7d4c-a6ef-41   44-a3ec-bf481f89b344,TimeStamp=24/01/2020 11:37:57] [FailureCategory=Cmdle  t-MRSRemotePermanentException] 3A7651ED,Microsoft.Exchange.Management.Migration.MailboxReplication.MoveRequest.NewMoveRequest    + PSComputerName        : ps.outlook.comIve

ran the disbale MRS, reset IIS, enable MRS and rest IIS.

Ran the HCW and get similar error.We believe that traffic is passing to/from on premise to cloud.

Ideas?
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