Outlook récupération sur un pc Microsoft office365, erreur sur chargement des emails reçus ou envoyés

[BrunoSchouler]

Yes, probably, but when I look from m'y Web site, on browser, thé certificate is OK ! Jow is it possible ? I suppose à cache problem in Outlook ?

[rg305]

Outlook doesn't use port 443, like your browser does.
They are connecting on two different ports - to two different services - using two different certs.

[BrunoSchouler]

And what solution do you offer to correct this problem ?

[rg305]

I don't know your system.
But the error comes from whatever service Outlook connects to.
That service is using the wrong cert.

[webprofusion]

@BrunoSchouler

And what solution do you offer to correct this problem ?

Each port/service can be bound to a different certificate and the configuration for that is specific to each service. So find the TLS/SSL configuration for the mail service the users are connecting to and check which file it tries to load, then check if that certificate file is recently modified.

[BrunoSchouler]

This is the indications received from server

[BrunoSchouler]

Including copy of test qualys ssl Labs

[rg305]

That is only for the Web Server [and only for port 443].
What port/service does the Outlook client connect to?

[webprofusion]

If try connecting to an imap port (for example) I get mentions of relaxed-wilbur.54-36-114-44.plesk.page in the chain:

 openssl s_client -connect webmail.autisme-espoir.org:143 -starttls imap
CONNECTED(00000003)
depth=1 C = US, O = Let's Encrypt, CN = R3
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = relaxed-wilbur.54-36-114-44.plesk.page
verify error:num=10:certificate has expired
notAfter=May  2 01:27:25 2021 GMT
verify return:1
depth=0 CN = relaxed-wilbur.54-36-114-44.plesk.page
notAfter=May  2 01:27:25 2021 GMT
verify return:1
---
Certificate chain
 0 s:CN = relaxed-wilbur.54-36-114-44.plesk.page
   i:C = US, O = Let's Encrypt, CN = R3
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: Feb  1 01:27:25 2021 GMT; NotAfter: May  2 01:27:25 2021 GMT
 1 s:C = US, O = Let's Encrypt, CN = R3
   i:O = Digital Signature Trust Co., CN = DST Root CA X3
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: Oct  7 19:21:40 2020 GMT; NotAfter: Sep 29 19:21:40 2021 GMT
---