In versions 3.9 and higher this message will come up when you log into Spire Desktop using the server name or IP address. This is by design and you can just click Ignore.
However, this message should not come up when you are logging into your Hostname.
The Hostname looks something like cooperative-river.spirelan.com
If this message comes up when you are logging into your Hostname, please try restarting the API Server Service and if that does not work, please do the below steps.
1. Go to C:\ProgramData\Spire\Server
2. Create a new folder in here call it Archive
3. Move all 3 files in the original folder into the Archive folder
4. Restart the Spire API Service in Services
5. Use the following link to hit the setup process again for this server: https://localhost:10880/setup
6. It may require you to log in first, but once you log in, it will try to recreate the hostname and it will take you through that part of the setup process again
7. Following this Spire should write 3 new files to replace the ones that we moved in #3
8. Then delete the archive folder
The below steps will also resolve this.
1. Rename C:\ProgramData\Spire\Server to C:\ProgramData\Spire\ServerBU on the server.
2. Run the Spire Server Installer again.
3. Select the same Hostname that you have been using, when asked, and a new certificate will be generated.
4. If everything works, then you can delete C:\ProgramData\Spire\ServerBU.