I've just installed two identical fax modems into a Windows Server 2003 Standard server and for whatever reason, the first one works fine and the other doesn't. They both create virtual COM ports and using SysInternals PortMon, I can see that commands are being sent to the first modem okay, but nothing is sent to the second modem (even though the application attempts to communicate with it -- and fails opening the COM port).
I've seen lots of posts about this type of issue online, but I can't find an explanation for why I can't have two identical modems working side-by-side, or whether it is, or is not possible.
The second modem's going back if I can't get it working.
sounds like a problem with the software not windows. can you send commands to both com ports and do they both respond independently? You should also ensure that the com ports are the ones on different IRQs (in the old days modems were set on irq 5 and 10 - for "performance")