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503 Service Unavailable

I have managed wordpress site currently experiencing intermittent 503 Service Unavailable. (


An example,


The 503 is coming from (behind the proxy).  The 503 response is very quick so I assume there are some rules or caching issues with the proxy.  


This is now impacting Pro Site from backing up the site as it is unable to connect.


Wp and all plugins are up-to-date.