[keycloak-user] 403 on /sso/login with Spring Boot and Keycloak Adapter

Hi, i have a little Spring Boot Application and it runs pretty nice together with the keycloak setup on my dev machine. Now when deploying the same application to another server i get something strange: When trying to access a protected resource, my browser gets a 302 to /sso/login which is ok but this URL should also produce a 302 to the final Keycloak Login Page. Instead i get a 403 on the sso/login request. The crazy thing is, on my local dev machine the /sso/login doesnt get a 403 but a 302 with the resulting valid and perfect URL (http://localhost:16177/auth/realms/XXXX/protocol/openid-connect/auth?resp...) What i want to say is.... i dont have a clue why i get a 403 on a resource /sso/login, which as i assume, is provided by spring keycloak adapter. And even crazier... its the same application. thanks for any hints. marc