Steps to identify and resolve the issue:
• Check the Keystore administrator in Visual Admin to determine the valid date and from date and these dates should be in the future and not expired.
• The dates for SSO will be the same in the application (system administration > system config >key store admin) as shown above; in the OS (Visual Admin) and in ECC (tcode: STRUSTSSO2). The OS generates a self signed certificate and this is stored in the application in the keystore area. This is exported and imported to ECC in tcode: STRUSTSSO2. 
• Check tcode STRUSTSSO2 in the system which has to be single signed on and determine under the certificate area the valid from and valid to dates and make sure they are in the future as shown above.
• If the certificate dates are old follow instructions in the below link to create a new certificate:
http://wiki.sdn.sap.com/wiki/display/EP/SSO+Certificate+Expiry
Also check to make sure the connection tests for the system object is successful and refresh the system object after the new certificate has been created
References:
http://help.sap.com/saphelp_nwes70/helpdata/EN/2c/f4e76d7f9e4ffbbc0bfbc0c16fe49d/content.htm
Thanks a lot for the information you are providing on SAP Webdynpro and the topics that are covered up.are very helpful.
i would like to ask that what is the scope of SAP webdynpro ABAP training what all topics
should be covered and has anyone studies from this course
http://www.wiziq.com/course/8153-sap-web-dynpro-pro-abap-training of SAP webdynpro ABAP training ??
or tell me any other guidance…
would really appreciate help… and Also i would like to thank for all the information you are
providing on SAP Webdynpro ABAP training.
Unknown said...
May 16, 2013 at 5:24 AM
Your blog is really useful for me, and I gathered some information from this blog. I did SAP Training in Chennai. It's really useful for me to make a bright career in IT industry.
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Unknown said...
December 27, 2015 at 10:44 PM