This video discusses an approach on using the DIS service logs, to correlate the name of the Mapping specification logs, to help debug the issues for failing mapping runs.
How to find in which host the Repository Integration service is running in a multi node domain
How to unassign services from an expired key and assign them to a valid key in 9.1.0 and 9.5.1
Converting and adding of a self signed certificate to use a Webservice Consumer transformation