Issue
This kind of error presents itself in a multitude of ways, but generally shows as a temporary inability to perform an action when no changes were made to any servers nor to the end user's machine. It will then suddenly begin to work, just as everyone is gathered together to resolve the issue and can not be reproduced.
"A transient error, also known as a transient fault, is an error that will resolve itself. Most typically these errors manifest as a connection to the database server being dropped. Also new connections to a server can't be opened. Transient errors can occur for example when hardware or network failure happens." -Google's short explanation
Resolution
Allowing a short time to pass will generally do the trick!
Related Links
An excellent examination of Transient Network Error can be found here:
https://docs.tibco.com/pub/businessevents-extreme/bex-1.0.4-august-2013/html/architectsguide/ch06s07.html
