SSO problem with the SAP Gateway Client /IWFND/GW_CLIENT

Since I ran into the same problem two times this week I thought it would be a good idea to post the solution in a small blog …

When configuring a demo system for SAP Gateway I tried to test an OData service using the SAP Gateway client /IWFND/GW_CLIENT and got the following error message:

HTTP Send failed:  

HTTPIO_ERROR_CUSTOM_MYSAPSSO~Fehlermeldung beim

Senden der Daten.

Since Single Sign-On is one of the key features of the SAP Gateway Client such an error message is quite annoying.

First possible root cause

The reason was that the following instance profile parameters were not set correctly.

login/accept_sso2_ticket

login/create_sso2_ticket

The correct values are (as mentioned in the Online Help 😉 😉 😉 Profile Parameters – SAP Gateway Foundation (SAP_GWFND) – SAP Library )

login/accept_sso2_ticket = 1

login/create_sso2_ticket = 2

So always read our documentation carefully 🙂 .

To test the settings without maintaining the instance profile you can use transaction RZ11.

Press the Display button and the following window opens:

Here you can choose the Change Value button that lets you change the parameter value immediately (but not permanently) so that I was able to proceed with my testing.

Second possible root cause

The same error also occurred in a second system but here the SSO problem did not vanish after changing the profile parameters mentioned above.

The error was more basic here since the certificates in that demo system were not valid anymore.

Looking into STRUST showed that something was wrong with the certificates.

An error that should hopefully not occur to often ;-).

Best Regards,

Andre