java.net.NoRouteToHostException: No route to host
This error is sometimes seen in networking issues in general, and is generally caused by problems like host name or address being incorrect, or maybe a bad DNS server or a bad router. Those are all conditions that lie within Google.
Keeping an open mind, it's possible that the problem may start with something simple, like the Blog URL / FTP Server settings.
Based on the number and variety of reports being published, the problem will probably be resolved by Blogger Support, but getting the problem recognised by them will likely start with help from the bloggers affected identifying the symptom.
If you are experiencing this problem, some basic diagnostic information (whatever you know and can provide) might be useful, to help Blogger Support identify an affinity. You'll find a number of open threads in Blogger Help Group: Publishing Trouble, where your details provided may make a difference.
- FTP Setting: Blog URL
- FTP Setting: FTP Server
- Name of FTP hosting service.
- Geographic location of FTP hosting service.
(Update 3/8 18:00): Some bloggers have discovered a workaround similar that used for the other currently hot problem. Clear cache, and publish a post as draft.
Cleared cache. Re-set post to draft status and tried again and Bingo! it worked.