BlogSpot Network Problems?

I'm a network troubleshooter, and got into Blogging only recently, when I needed to setup a website quickly. So when I hear Bloggers describe problems that may well be network related, not related to the silence at Blogger, my ears perk up.

So today I see mention of possible DNS or MTU problems accessing blogspot.com.

• Before Upgrading to Beta - READ THIS, first seen 8/23 in a subthread.
  
• We're sorry, but we were unable to complete your request., first seen 8/23 in a subthread.
  

And here's an ongoing problem. When you're in Post Edit, you see (on and off, constantly)

Could not connect to Blogger.com. Saving and publishing may fail.

• Google Blogger Help - Something Is Broken: Image Uploading Update

DNS / MTU problems can have varied symptoms.
You try to browse to http://www.example.gov, and you get a cryptic

• Firefox can't find the server at www.example.gov.
  
• We can't find "www.example.gov".
  
• The classical
  

  404 Not Found

  
  
• The also classical white screen, with "Done" in the status bar.
  

Now the above examples could have been caused by any of several scenarios.

• Host www.example.gov doesn't exist (you typed the name wrong).
  
• Host www.example.gov isn't operational today (it's down).
  
• Your DNS (that translates www.example.gov into an IP address) isn't working (your ISP is borked).
  
• Your MTU setting is causing a problem with accessing www.example.gov (somewhere in the Internet, something changed).
  
• You don't have Internet connectivity (DOHH).
  

I'll generally refer you to any of 3 articles of mine.

• Internet Connectivity Problems Caused By The MTU Setting
  
• The DNS Server Settings On Your Computer
  
• Identifying A DNS Problem In Your Internet Service
  

Given the possibility that the problem might be with Blogspot, maybe WordPress is a good alternative here.

• Internet Connectivity Problems Caused By The MTU Setting
  
• The DNS Server Settings On Your Computer
  
• Identifying A DNS Problem In Your Internet Service
  

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