No Gui Error code: SEC_ERROR_UNKNOWN_ISSUER

I have a new node that was set up a few months ago and have had a few Gui problems. Now Gui does not show and I get a Error code: SEC_ERROR_UNKNOWN_ISSUER.

I got this similar problem on another node earlier this year and fixed it but don't remember how.

pveversion -v
proxmox-ve: 8.3.0 (running kernel: 6.8.12-5-pve)
pve-manager: 8.3.1 (running version: 8.3.1/fb48e850ef9dde27)
proxmox-kernel-helper: 8.1.0
proxmox-kernel-6.8: 6.8.12-5
proxmox-kernel-6.8.12-5-pve-signed: 6.8.12-5...

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