I have a network scanner, Kodak Scan Station 500, that I am having issues with. It has been inplace for several months now working without any issues. However I recently made a network change and have been having issues with the scanner. The change was that I replaced a 3560 switch with a 3750X stack.
Here is a description of my network setup. I have an ASA (192.168.1.2) that connects to the T1 internet connection. I have (2) 3750X's (192.168.1.1) that are in a stack. There is a HP switch, I believe a 2824, that sits in between the ASA and 3750's.
In the network the default gateway is set to 192.168.1.1. For public internet access the 3750 then has a static route and default gateway of 192.168.1.2 for the ASA. The scanner and ASA are plugged into the HP switch. The HP switch is plugged into the 3750.
After installing the 3750 stack, the scanner stopped being able to send of scans via the smtp server. After looking into the issue, I saw that the scanner was connecting to the smtp server and authenticating succesfully. It made it all the way to sending the data in the smtp connection, at which point it times out after 30 seconds.
After doing some testing I found that by setting the gateway for the scanner directly to the ASA so the smtp traffic does not pass through the 3750. After doing this, the scanner started working again. So basically, by passing through the 3750, the smtp connection is timing out. This didnt happen with the 3560.
Any ideas on what could be causing this?