if any of you have this error on windows server, restarting “cbq-engine.exe” on the node you are having a problem querying with resolved this error for me.
Task manager and ending the process also helps as the couchbase engine restarts the query service automatically
Glad you found a solution and welcome to the forums!
You may also want to have a quick look at the log files to see if there is anything you can report about the cbq-engine.exe process when it’s in the bad state.