I am unable to (suddenly) to connect to either Google+ or Hangouts on my device.  Web is fine and other devices are fine, but my Nexus 5 is giving me errors ... 

Google+ is saying " No Connection.  Couldn't Connect to the Server"
Hangouts won't sign in. "Possibly because there's a problem with Google account permissions"

I typically have two accounts on my devices.  a Gmail based main account (syncs everything) which is my main Google account and a work email based one which I only use for docs and calendar .

Things were initially fine (first few hours) and then the Nexus 5 threw up some sync errors on the main account and since I can't sign in without error. 

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