Hi erwin69,
Check instance name you are trying to connect and also make sure that SQL Browser service is running.
Refer the below links.
http://stackoverflow.com/questions/13754563/sql-network-interfaces-error-26-error-locating-server-instance-specified
https://blogs.msdn.microsoft.com/sql_protocols/2007/05/13/sql-network-interfaces-error-26-error-locating-serverinstance-specified/
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