Hello Sumit,
You do not need multiple service providers on the Portal.
If you want that the Portal is accessed with different aliases then you can do the following, assuming you use Microsoft ADFS as an IDP:
- For each Portal alias add manually new Assertion Consumer Service (ACS) URL in ADFS for the Portal (trusted relying party), e.g. https://portal1.acme.com/irj/portal, https://portal2.acme.com/irj/portal, etc.
- On the Portal system in NWA -> Authentication & SSO -> SAML 2.0 -> Trusted Providers: select the entry for the ADFS and under "Authentication Requirements" select "Application URL" for the authentication response setting.
If the user accesses different URL on the Portal for the SRM scenario then instead of https://<portalalias>/irj/portal add this URL as ACS URL in the ADFS configuration.
Best regards,
Dimitar Mihaylov