Access a WEB service from R3

[Rima]

What is required from a security aspect to allow an R3 system to access a WEB service on a Portal system?

On the R3 system the programmers created a proxy object based on a URL to a WEB service in the Portal and then an ABAP report to access the WEB service via the proxy object.

From a BASIS standpoint what would have to exist to allow this connection to succeed?

The R3 system can accept login tickets and in STRUSTSSO2 the Portal system certificate has been added. A trust has been added in the Portal for the R3 system.

Is an HTTPS port required?

Anything else?

Thanks,
Rima

[Rima]

I forgot to add that when we try to actually access the WEB service, this is what we receive:

Unexpected element -el=html ns=

Thanks,
Rima