This error indicates that an operation exceeded a time out and was aborted.
The cause will vary depending on the context. The error should have an associated message which should help.
The fix will depend ont he source of the error. Generally, seeing this error indicates that the application has a flaw in that it isn't properly handling it and providing either a solution or more information. Please contact Admin Arsenal support with the details of the error and we can help find the cause and solution as well as ensure that the application handles the error better in the future.