DB Link to access SQL Server through Oracle Error

I am struggling to get an HS link to work to access an SQL Server db

I have:
configured tns and listener
hs.init file
configured and sucessfully tested odbc link

yet get error:
ORA-28545 error diagnosed by Net8...

Any pointers on how to solve?
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DavidSenior Oracle Database AdministratorCommented:
What is the Net8 NCRO error message?  You might provide the referenced files
- what is you oracle version and os platform?
- also do you have oracle_home entry in the environment variables? to which path it refers to?
- have you bounce your listener after setting up the HS?

- can you also share the link to the doc/article that you refer to when preparing the HS?

don't use HS
use this instead:
Oracle Database Gateway for SQL Server

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- the reason i ask for the OS platform is that, if its a 64bit OS, the asker need to use Oracle Gateway because HS is not supported on 64bit. if its a 32bit, HS is sufficient.
55murphy55Author Commented:
Many thanks - problem solved with gateway!
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