SCOM/OPSMGR: Web Application: Untrusted CA

Context:

• You created a web application which use https (SSL)
• The checkbox “monitor SSL health” is checked
• When you log on the watcher node and call the same pages, you don't have any security alert through internet explorer
• You do have the following error:

Cause:
You are missing a certificate on the chaine. Your user account has the full chaine, but not the computer account. In my case, i had to add a Verisign (Class 3) certificate for the local computer account:
…And alerts are gone! We could just uncheck the health monitoring of certificate, but it's always better to get notified when it's expired

OpsMgr/Scom: error 2130771918 on all TCP & web applications

After installing a SCOM hotfix with errors, all TCP and web applications monitors stopped working with always the same error: 2130771918. For example, even a TCP test on the RMS itself failed:
After opening a call to MS, they give us the patch for KB 957511. We are not concerned by this KB but it contains a more recent version of DLL Momnetworkmodules.dll, which does TCP and web applications tests. Once this dll updatedn the problem was gone.

By the way it could have been necessary to register again this dll with:

regsvr32 “c:\program files\system center operations manager 2007\momnetworkmodules.dll”