If you are using a self-signed SSL certificate for your DualShield SSO, then you need to import the DualShield SSO's CA certificate into the local computer certificate store as a root trusted CA on your ADFS server.

Furthermore, you need to disable the revocation check on the self-signed certificate.

On the ADFS server, execute the following commands in the Windows Powershell console:

Add-PSSnapin Microsoft.Adfs.Powershell
Set-ADFSClaimsProviderTrust -TargetName "Claims_Provider_Name" -SigningCertificateRevocationCheck None

Similarly, if you are using a self-signed certificate for your relying party application, then you have to import the self-signed CA certificate into the local computer certificate store as a root trusted CA on your ADFS server. Then, execute the following commands on the Windows Powershell console:

Add-PSSnapin Microsoft.Adfs.Powershell
Set-ADFSRelyingPartyTrust  -targetname "Relying_Party_Name" -EncryptionCertificateRevocationCheck None