If you are having system connectivity issues, here are some things to consider:
- Are there security rules on the network (such as firewalls or routers) that might be preventing this traffic?
 - Is traffic from SPP routable to the network address of the managed system?
 - Are there any problems with cables, hubs, or switches, and so forth?
 
You could be experiencing network issues like these:
- Network outage
 - Router misconfiguration
 - Unplugged wire
 - Switch not working
 
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