Try each of the following:
denode.ckpool.org:3333
denode.ckpool.org:443
denode.ckpool.org:80
All is dead!

I saw you authorise on the pool at this time:
[2020-05-28 23:15:29.387] Authorised client 1085395 worker 39hL2zBfBZAjJKLkPvrR85crgbsKqW8sCR as user 39hL2zBfBZAjJKLkPvrR85crgbsKqW8sCR
and then drop at this time:
[2020-05-28 23:15:44.775] Dropped client 1085395 user 39hL2zBfBZAjJKLkPvrR85crgbsKqW8sCR worker 39hL2zBfBZAjJKLkPvrR85crgbsKqW8sCR
So at some stage you successfully connected for 15 minutes (approximately 90 minutes ago). What did you do then?