Situation : I am using Sun_SSH_1.1.8 (at least 10 years old) in my below (Sun Solaris) box/servers :

From U1@Box1 I ssh to U2@Box2, then U3@Box3, then U4@Box4. There are authorised_keys setup between U1@Box1 -> U2@Box2, U2@Box2 -> U3@Box3, and U3@Box3 -> U4@Box4, hence, no need of password

Question : How can I login from U1@Box1 to U4@Box4 without being asked for password?

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