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lug-ms's avatar
lug-ms
Copper Contributor
Dec 17, 2020

Cant set smtp tls certificate for send-connector

I have an Exchange in Hybrid Mode with O365. After renewing the certificate (not self signed, its from sectigo) I cant assign it to SMTP, and therefore I cannot assign it to the "Outbound to O365" C...
2016
Exchange Server
office 365
ic-rohn's avatar
ic-rohn
Copper Contributor
Dec 29, 2022

Hello Ahmed, 

I have the same issue as lug-ms 

I have two Exchange Server 2016 (CU23) in Hybrid Mode with O365. After renewing the certificate I cant assign it  to the "Outbound to O365" Connector or any other Send-Connector. I got the same error:

I try to enable the certificate (thumbprint 7AEE6646B5F788B61A2101A928B141C59A1EFC08):

You see, the certificate is not activate for SMTP and trying to assign it to the Outbound-Connector throws the same error. 

Another view to the certificates of the server:

Only the Federation-certificate is activated for SMTP. 

But when I try to activate another certificate for SMTP, I get this warning:

Is this a problem of the german version of the exchange-server?

How can I activate then new certificate to a Send-Connector?

 

RS_168's avatar
RS_168
Copper Contributor
Nov 20, 2023

ic-rohn 

My problem was that I had installed two certificates with the same subject and the same issuer. The old (possibly expired) certificate must be deleted from Exchange at first.

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