Hello Vijay,
I got the same error with yours before.
And then I run this config on more than 3 ABAP systems and it worked.
I advise you to try to run the wizard for other ABAP systems to see whether portal part is woorking.
Then you can delete ADS_AGENT user and ADS RFC connection on ABAP system.
And run wizard again.
Hope this helps,
Regards,
Yuksel AKCINAR