Apple Support Discussions user "Durandel" reports the issue:
Error: Couldn't reach the MobileMe configuration server. Try publishing again later.Later in the thread "Durandel" offers a solution that worked for them:
Well, I tried later. 24 hours later. What's up?
- Go to Finder -> HomeFolder -> Library
- Move entire folder "Caches" to desktop
- Restart iWeb and publish
- It should work now
- You can now delete "Caches" folder in desktop.
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