When trying to start db2admin from the command prompt I ger the following error

db2start.exe
SQL6031N Error in the db2nodes.cfg file at line number "1". Reason code "10".

[code]
C:\>db2 ? SQL6031N


SQL6031N Error in the db2nodes.cfg file at line number
"<line>". Reason code "<reason-code>".

Explanation:

The statement cannot be processed because of a problem with the
db2nodes.cfg file, as indicated by the following reason codes:


...

(10) The hostname at line "<line>" of the db2nodes.cfg file in
the sqllib directory is not valid.

...

User Response:

The action corresponding to the reason code is:

...

(10) Ensure the hostname value defined in db2nodes.cfg at line
"<line>" is both defined on the system and operational.

...

Thanks this did the trick I forgot that I had changed my computer name