Import Error Msg :”Could not retrieve source file for port”

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Symptom
We are trying to connect MDM Import Manger with Type = Port at the “Connect to source” screen and it is failing with error message “Could not retrieve source file for port…”.
Other terms
0000676967 2009
Reason and Prerequisites
Various ways could lead to this situation, for example:
1) Momentary “disappearance” of the NFS which host the Distribution folder.
2) Unsuccessful node failover in the cluster.
3) A human moving the file from the Exceptions into the Ready in order to try to re-import.
Solution
Please try the following solution in order to solve this issue:
1) Save the erroneous file structure (the file from structuralX folder) into temporary folder.
2) Stop MDM server.
3) Rename the mds.ini file to any temporary file name. This is to enforce MDM server to crate a new mds.ini file.
4) [...]