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Outlook appears to be using an outdated SSL certificate for some reason, possible cached somehow? we're using IMAP mail, and i renewed the cert tuesday, then expanded the cert on wednesday to cover another domain as a Server Additional Name. Outlook keeps saying the cert was only updated tuesday. SSL labs shows the correct certificate
the certificate serial numbers do not match.
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Hi @Joe Kluthe
Could you please tell what's your email server? Or are you using Exchange server? And is your certificate issued by a commercial CA?
Have you tried login your account with Outlook clients on other devices to see if the certificate is updated? Or try creating a new profile for your account to clear the cache?
And another way we could consider is manually adding the correct certificate to the trusted root certificate store on all client computers and devices to see if it update on your outlook client?
we use iredmail, so it's an imap solution. we use a certificate from letsencrypt, from the isrg x1, which is trusted. and other devices are having the issues.
and making a new mail profile doesn't help. i even force renewed our cert about 10 minutes ago, outlook is still pulling one from the 1st.
looks like i fixed it.
https://forum.iredmail.org/topic16099-mismatch-in-ssl-certificates-for-nginx-and-ms-outlook-as-client.html
that helped. i hadn't restarted postfix, only nginx and dovecot. restarting the postfix service on the server appears to have fixed the issue
Hi @Joe Kluthe
Glad to know that your issue is resolved and thanks for sharing the solution here! Since our forum has the policy that The question author cannot accept their own answer. They can only accept answers by others, and according to the scenario introduced here: Answering your own questions on Microsoft Q&A
I would make a brief summary of this post so that other forum members could easily find useful information here:
[outlook not receiving updated ssl certificate - Summary]
Issue Symptom:
Outlook not receiving updated ssl certificate, and appears to be using an outdated SSL certificate
Solution:
Restarting the postfix service on the server appears to have fixed the issue
Reference Links:
https://forum.iredmail.org/topic16099-mismatch-in-ssl-certificates-for-nginx-and-ms-outlook-as-client.html
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