Oracle Access Manager (OAM) Servers can run in one of three security modes OPEN, SIMPLE, or CERT
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WegGate is a Policy Enforcement Point (PEP) deployed with Web Server and communicates to OAM Servers (Policy Decision Point – PDP). WebGate communicates to OAM Access Server on proxy port (default value 5575) and default security mode OPEN.
To change OAM security mode from OPEN to SIMPLE or CERT or vice versa
For complete steps click here