Have you checked the interface status to ensure it is up up? What speed is the S4820 negotiating at? The SSG5 support 10/100, I am not sure if the S4820 will negotiate to those speeds.
Hi,  another issue with my S4820T. I have also 2 Netscreen SSG5 in a HA-Cluster for Failover and want to connect them to my S4820T. I get a Link-Light but no traffic at all. Are there any specialities to configure these 2 ports?  Thx
S4820T to Netscreen SSG5