Could you post your site URL here, so I can have a look? What is the URL of a post that failed to publish on Google+?
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According to the error log, Google responded to our request to publish the post that they received an error: HTTP error: Operation timed out after 5001 milliseconds with 0 bytes received.
That suggests that either your server may have been offline, unresponsive, or responded slowly (at least slower than Google+ expected).
What is the solution? I tried with around 5-6 posts. It did not work at all.
I’d suggest checking with your hosting provider to ensure they wouldn’t be blocking Google or Google+’s scraper and/or contacting Google for assistance.
Until Google+ is able to visit your site, I don’t believe there is anything on our end we can do.