Link security with LU6.1

Link security restricts the resources that a user can access, depending on the remote system from which they are accessed. The practical effect of link security is to prevent a remote user from attaching a transaction or accessing a resource for which the link userid has no authority.

Each link between systems is given an access authority defined by a link userid. A link userid for LU6.1 is a userid defined on your sessions definition for this connection. If not defined there, the link userid is taken to be the SECURITYNAME userid specified on the connection definition. If there is no SECURITYNAME, the link userid is the local region's default userid.

You cannot function ship to CICS® without having a security check. However, the security check is minimized if the link userid matches the local region's userid:

If a failure occurs in establishing link security, the link is given the security of the local region's default user. This would happen if, for example, the preset session userid had been revoked.