![The name on the security certificate is invalid or does not match the name of the site" error in Outlook in a dedicated or ITAR Office 365 environment The name on the security certificate is invalid or does not match the name of the site" error in Outlook in a dedicated or ITAR Office 365 environment](https://support.content.office.net/en-us/media/18adb089-9750-d2e7-3e2c-31f09d6b4aa0.png)
The name on the security certificate is invalid or does not match the name of the site" error in Outlook in a dedicated or ITAR Office 365 environment
![Configure a certificate-based connector to relay email messages through Microsoft 365 - Exchange | Microsoft Docs Configure a certificate-based connector to relay email messages through Microsoft 365 - Exchange | Microsoft Docs](https://docs.microsoft.com/en-us/exchange/troubleshoot/exchangeonline/email-delivery/media/office-365-notice/forwarded-message.png)
Configure a certificate-based connector to relay email messages through Microsoft 365 - Exchange | Microsoft Docs
![Exchange / Outlook - Security Alert - (The security certificate was issued by a company you have no chosen to trust) | PeteNetLive Exchange / Outlook - Security Alert - (The security certificate was issued by a company you have no chosen to trust) | PeteNetLive](http://www.petenetlive.com/KB/Media/0000454/error.png)
Exchange / Outlook - Security Alert - (The security certificate was issued by a company you have no chosen to trust) | PeteNetLive
![What to do if you receive a 'Connector certificate expiring soon' alert from Microsoft? – Exclaimer Knowledge Base What to do if you receive a 'Connector certificate expiring soon' alert from Microsoft? – Exclaimer Knowledge Base](https://exclaimerkbimages.blob.core.windows.net/images/Exclaimer%20Cloud/Signature%20Rules/Microsoft_error.png)
What to do if you receive a 'Connector certificate expiring soon' alert from Microsoft? – Exclaimer Knowledge Base
![Configure a certificate-based connector to relay email messages through Microsoft 365 - Exchange | Microsoft Docs Configure a certificate-based connector to relay email messages through Microsoft 365 - Exchange | Microsoft Docs](https://docs.microsoft.com/en-us/exchange/troubleshoot/exchangeonline/email-delivery/media/office-365-notice/new-connector.png)