After Security update on High Sierra iMac, all my suites are now emitting this message after register, validate, and run:
REGISTERED test -> test Valid for cylc-7.8.8 ERROR: No hosts currently compatible with this global configuration: suite servers -> run hosts:  suite servers -> run host select -> rank: random suite servers -> run host select -> thresholds: ERROR Contact info not found for suite "test", suite not running?
the ~/.cylc/global.rc file shows no differences over quite some time with respect to the offending settings:
[suite servers] run ports = 43001..43100 run hosts = condemned hosts = scan hosts = scan ports = 43001..43100 auto restart delay = [[run host select]] thresholds = rank = random
maybe the ports?
generate a new global.rc?