SAML: APM as Service Provider (SP) role - is it possible to do SSO credential mapping to the backend server?

Is your SharePoint federated with ADFS and are you running in claims mode? I have the F5 as a SP to SharePoint but I don't have ADFS. Realistically you might be looking to have F5 be an SP to ADFS depending on the flow of things and answer to some of the questions I put. Since this get some complex you should try to put a more detailed message about your environment and what you're trying to do. I have the following F5 SP that bounces to an F5 IdP (to pick up SSO from our dedicated SSO virtual server/apm) I have a virtual server for SharePoint that I put an access policy that does an SAML Auth (to the IdP) once it's authenticated against the IdP I take the information out of the SAML attributes put the the user name and pwd into the SSO session variables and do a SSO NTLM configuration to SharePoint. I'll post more details if this solution works for you.