@PhilipDAth wrote: Does the switch that can not connect have its management IP in the same subnet and VLAN as the other switches which do work? Yes they do, the first member of the stack is x.x.x.10 and the second member is x.x.x.11, both in VLAN 10 and with /24 subnet mask. The second member is the one with the connection issue. The other switches not in the stack are x.x.x.12, x.x.x.13, x.x.x.150, x.x.x.151.
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