How to create the SSO (SINGLE SIGN ON) in sap system?  What is the procudure?

1. Download the verify.der file to your local (portal server) file system.

a) As portal user navigate to System Administration -> System Configuration -> Keystore Administration.

b) Choose Download verify.der File and store the file in your localfilesystem.

c) UnZIP this file (e.g. using WinZIP or WinRAR) to be able to store verify.der.

2.  Upload the verify.der file to your ABAP based backend system.
Caution: Only one user can access the STRUSTSSO2 transaction, so you may have to wait until other groups have left STRUSTSSO2.

a) Launch the SAP Logon shortcut on your portal’s server desktop.

b) Create an entry for you ABAP based backend system .

c) Logon to that system to client 100 with user.

d) Launch transaction STRUSTSSO2 and press the Import certificate icon (in area Certificate). In field File path, browse to the verify.der file and press Enter.

e) Press the Add to Certificate List button and Save.
Hint: Do not exit the transaction, because to have to add the entry to the ACL (see next task).

f) From the certificates list (area Cert. List), double-click the entry for .your. portal server, e.g. CN=SID.

g) Choose Add to ACL and provide the following data: 
System ID. Your portal server system ID, e.g. SID, 
Client your portal server client which should be 000

h) Save your entry and exit the transaction.

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