I'm receiving the following error from the collector:
Event ID: 905
Category: Collector Client
The EventSentry agent is unable to establish a secure connection with any of the listed collectors:
servername.domain.local@5001: Could not acquire security credentials: error 0x80090331. (273)
You will receive this error message if your "SCHANNEL > PROTOCOLS" registry settings are configured incorrectly. Open 'Regedit' and navigate to:
There will more than likely be multiple protocols listed, and if you expand each protocol (e.g., TLS 1.0), then you will see both a CLIENT and SERVER subkey. If your SSL/TLS configuration is incorrect, then you will see the following registry values in both the CLIENT and SERVER subkeys:
Here is an example:
For TLS 1.0, TLS 1.1 and TLS 1.2, the CLIENT subkey should only have DisabledByDefault set to 0, and the SERVER subkey should only have Enabled with a value of 1.
To delete the corrupt values, open an elevated command prompt and run the following command:
reg delete HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols
Then, you can download and import the .reg file included in the link below which will enable all the TLS protocols while leaving SSL 2.0 / SSL 3.0 disabled.