Pinging issue on a couple of windows 2003 servers

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Here is the scenario:

I have three 3Com 4200G series switches. I have 8 servers. All servers are HP Proliant DL380, 360, or 320 servers. All servers are connected to the same 3COM switch. I have 2 APC Smart-UPS 5000 RM XL. These are plugged into the same 3COM switch. I'm having an issue in which some of the servers can ping both of these APC devices, some can only ping 1 of the APC devices, and some cannot ping either of them. All servers can ping each other. I can't figure out why some of the servers can ping the APC devices and some can't. It doesn't make any sense. The 3COM switches are not specifically configured for anything special. All ports are the standard default settings, and set to Auto-negotiate. I can't find anything in the APC Network Card Mgmt interfaces that would need to be configured to allow pings from a certain server. One thing to note is that from the APC Interface, I also can't ping the server that has the communication problem with the APC device. It's like they are blocking each other or something. Also, it would seem that one of the servers can't even ping the network switch that it is plugged into, but can ping the other 2 switches just fine.

The Windows firewall is not running on the servers. I'm not sure if there is still some specific port(s) being blocked. When I have configured the servers from scratch, I always use the HP SmartStart CD. After the OS is installed, there is a window that pops up talking about whether or not you want to open all the server ports. I thought I had always hit yes, but I'm wondering if I didn't or something, and I have no idea how to get that window to pop back up. Is there a registry setting on the server that I can change to allow all traffic without using the Windows Firewall config? I did actually start the Windows firewall/ICS service so I could check to allow ping requests and such, then I disabled it again, but that didn't do anything for me.

I'm really stumped. I am going to try and move one of the problem servers to a new port on the switch to see if that makes a difference. Unfortunately, this site is remote, and I have to have one of my people there do that in the morning. It definitely could be some goofy setting with the 3Com, and I might have to call 3Com support, but just curious if anyone might have seen this before with 3COM switches?

Thanks,

Sara


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