(As of 12/15/2018 : )
According to This preceding posting, this site had experienced some down-time, due to a problem with my router. I’m happy to say, that the router is working fine again, and that therefore, my blog is back Up.
(Edit 12/17/2018, 13h25 : )
After using helpful information supplied by a tech support person, working for my ISP, I am now somewhat convinced, that the malfunction was due to a misbehaving client device, plugged in to a physical Ethernet jack.
I do not intend to activate that client computer again – ever.