Never encountered this before - typical card reader access controller connected to network with static IP and communicates to host PC for door control. The controller operates fine stand alone disconnected from switch, online it will fail after a short time. By failure I mean that it can't function. It will start to reboot for unknown reasons, it's own firmware does not seem to run correctly. As soon as it is disconnected from the 3750 switch, it goes right back to normal. The manufacturer, Sielox, claimed that POE from the switch port was the cause. POE is not enabled on this switch. We connected a small Netgear switch between the controller and the 3750 and everything worked well for a couple of months. Now the same thing. It is as if this switch does not like this controller. It's been swapped out and even added a second one along side only to see both of them have the same failure. These controllers are used on networks all around the country and never have this problem. What is the 3750 doing to these controllers? Is it due to certain ports used for communication? So far, nobody can explain this unusual device behavior.
We would welcome any feedback on what could be the solution to this, as this customer is getting quite annoyed by such failure.
