SSL Certificate Sensor wrong certificate, SNI given

Modified on 2025-06-10 20:33:03 +0200

I configured the ssl certificate sensort as usual. The Server is behind a firewall we do not have fully control over it. When I open the DNS name in my browser, the page appears and with the correct SSL certificate given.

But PRTG SSL certificate sensor check the Firewalls HTTPS certificate. It makes NO sense. I added a device and used the webpages DNS name as target, also I entered the virtuals hosts FQDN (SNI Domain) in the ssl certificate sensor. No difference.

How can that be fixed?

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The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.

SSL Certificate Sensor wrong certificate, SNI given

Article CommentsAttention: This article is a record of a conversation with the Paessler support team. The information in this conversation is not updated to preserve the historical record. As a result, some of the information or recommendations in this conversation might be out of date.

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Attention: This article is a record of a conversation with the Paessler support team. The information in this conversation is not updated to preserve the historical record. As a result, some of the information or recommendations in this conversation might be out of date.