We have a few servers running FMS 188.8.131.524 (haven't been able to schedule downtime yet) that up to a couple of days ago have been just fine. Then yesterday, one of them decided to not allow connections with Safari under MacOS 10.13.4. Other servers with the same spec are still available, but this one has decided that it can't establish a secure connection (they are all running with the same wildcard cert). When I remote into the offending server, I can launch the console using localhost.
I haven't tried a restart yet, and there is a patch to be applied, but I'm curious to know if anyone else has witnessed this behavior and if they know of a fix. I've cleared out the cache and keychain records to no avail.