Cannot connect to LOB System - BCS Issue

Issue
 
All of a sudden, when your BCS stopped working and you are getting the below issue,
"Cannot connect to LOB system"
 
Cause of the Issue
 
BCS files may be referring the wrong connection wrong and you might have changed it in the bcs files. Also BCS files would have been updated in the SharePoint server, but still you are getting the issue.
 
Resolution

Issue is old files are not properly updated and still referring the old connection string. So you need to delete all the BCS files and again need to deploy it in the SharePoint server. This solves the issue.

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