Fix #DB2 Communication protocol failed to start issue: SQL5043N

By | November 21, 2017

I moved my DB2 installation to a new server from a full back-up. After performing all the necessary steps:
1. Recreate the necessary users: db2inst1, db2fenc1, db2das1
2. Give ownership to their home directories

ISSUE:
I tried to start the instance. I logged in to the db2inst1 user and started the database.
This was the result:

INVESTIGATION:
Looking at the reported issue with db2diag, the last entry looked like:

FIX:
The fix is to add an entry in /etc/services for the db2 TCP service

Then just db2stop and try again:

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