Just other day I was engaged with an Enterprise customer as he was experiencing a SSL Cert déjà vu, it was disappearing from the IIS site Binding. It was interesting for sure, and hence the preclude for blogging it!
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First thing first, what’s the error message here? An event similar to the following is logged in the System event log:
Log Name: System
Source: Microsoft-Windows-HttpEvent
Date: 3/25/2017 5:33:23 PM
Event ID: 15300
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: IISServer
Description:
SSL Certificate Settings deleted for Port : x.x.x.x:443
The error description does match with the symptom, so it’s a good start for now. The problem occurs because of a legacy SSL certificate hash property interfering with the current SSL binding, resulting in the correct binding being deleted.
The fix was rather simple, if you know where to look at. We located the following property in the applicationHost.config file and deleted it:
An iisreset is not necessary after the above change, but recommended.
This post first appeared on MSDN Blogs | Get The Latest Information, Insights, Announcements, And News From Microsoft Experts And Developers In The MSDN Blogs., please read the originial post: here
