Unable to connect a 11.7 client to a 11.3 DataServer Broker.

Unable to connect a 11.7 client to a 11.3 DataServer Broker.
11.3 client to 11.3 DataServer broker works fine.
If the client version is 11.7 it does not work.
The only thing changing is the client version.
OE compatability articles indicate that this configuration should work.
Error message mentioned a username that appears to be encrypted. 

Clients are on Linux, both schema holder and DataServer broker are on Windows, same machine.
11.7 client is using the same connection string as 11.7.  

On OE 11.4 that was a change to encrypt the username and password when connecting to MSS Dataserver broker.
The 11.7 client has this change, when connecting to a 11.3 DataServer Broker, the broker does not know how to decrypt the information that is provided.
Hence the error with the encrypted user name.

Upgrade the DataServer Broker version to match the client version.

Use the -znoencrypt parameter which reverts the behaviour to pre 11.4.
 
Note: The -znoencrypt parameter does not work in a ABL connect statement.
The following error is returned:

 Warning: -znoencrypt is not a database parameter and was ignored. (1402)

This parameter must be used as a client startup parameter. 

 

References to Other Documentation:
Progress Article(s):
Progress OpenEdge Connectivity rules with previous/later versions
FAQ regarding the DataServer for ODBC phaseout.