Summary: This article will help you understand the reason behind Outlook ‘0X80072F06’ error, and methods to fix the error.
When using an Exchange Offline Address Book (OAB) for your Outlook application, you might encounter ‘0X80072f06’ error.
Understanding the Occurrences of ‘0X80072f06’ error
The error can occur in these two formats:
- When trying to update OAB files to the server, you can receive an error message:
Error ‘0X80072f06’ error: The security certificate on the server is not valid. Contact your Exchange Server administrator of ISP to install a valid certificate on the server.
- While sending an email from Outlook connected with Exchange Server, an error message “Unknown Error 0x80072F06” might appear.
What causes Outlook ‘0X80072f06’ error?
This error is caused due to:
- Invalid security certificate
- Or, when the “hostname does not match with your server’s security certificate”.
How to fix Outlook ‘0X80072f06’ error?
Let’s look at the methods you can try to resolve the problem with security certificate that causes Outlook ‘0X80072f06’ error:
Method 1 – Make sure that your system’s SSL settings are correct
Step 1: Launch Internet Explorer
Step 2: Click on Tools, and then click on Internet Options.
Step 3: From the Internet Options pop-up window, select the Advanced tab and under the Settings window scroll down to the Security section
Step 4: Make sure that the checkbox beside the Use SSL 2.0/3.0 option is checked
Step 5: Uncheck the checkbox “Check for server certificate revocation”
Step 6: Click on Apply, and then click Ok
Step 7: Exit the Internet Explorer window and launch it again to ensure that the new settings are in effect, and then check if the issue has been fixed.
Note: Also, make sure that the OAB (Offline Address Book) URL is configured correctly in SSL certificate.
Method 2 – Check the proxy settings
Step 1: Open Control Panel and search for Internet Options
Step 2: Click on the Internet Options tab
Step 3: From the Internet Properties pop-up window, click on the Connections tab
Step 4: Click on the LAN settings button
Step 5: Uncheck the checkbox “Automatically detect settings” under the Automatic configuration section, and then click OK
Step 6: Next, click on Apply, and then click OK and check if the problem is resolved
NOTE: Even if Outlook ‘0X80072f06’ error is fixed, you could experience problem downloading the Offline Address Book. That’s because, if your Outlook account was created less than 24 hours ago, the Exchange server will not have generated the OAB yet. If so, try downloading the Offline Address Book again once it is generated by the Exchange server.
An end note!
Hope that the above discussed methods will help you solve Outlook ‘0X80072f06’ error. However, you might also experience OST file corruption, when trying to synchronize the ‘.ost’ file in Outlook. In that case, you may try using a reliable OST to PST converter, as it can help you easily and quickly extract corrupted or damaged OST data and save it in Outlook supported PST file format.