Today I have faced an issue for one of my clients when tried to publish the customization.
I was trying to put the server in the Maintenance Mode.
As you aware, there is an option in Acumatica to do the auto update.
By default it is partially on, and pointing to the acumatica server:
Please note, even if you did not check "Check for Updates" option,
EVERY TIME YOU OPEN THE SCREEN IT GOES TO http://update.acumatica.com JUST TO VERIFY THE SERVER IS ON.
So what happened today is that Acumatica update server was down and it caused me to wait XX seconds till the timeout to see this:
In short, it is highly recommended, if you do not use the Auto Update feature, please do a complete cleanup till you have it like this:
No more error, just a warning and no delays.
All the best,