I have a Xymon install that was monitoring (among other things) an HTTPS site. That site moved to a new IP and while I did update the public DNS records it was a few days (or maybe two weeks?) before I remembered to update the internal DNS records. By then, Xymon was reporting red for HTTPS and purple for SSL.
I've corrected the DNS records and the VM running Xymon is resolving it correctly, but now it is still showing the same red and purple alerts. Every now and then, they'll switch to green for a little while and then back to red and purple. I'm not sure why.
Xymon's web interface shows that the certificate is valid for more than 2 months. So that isn't it. I've restarted the Xymon server process and even the whole OS, but this issue remains.