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Serial Port will not open in Windows 7 Pro

Posted on 2011-02-22
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Last Modified: 2012-06-22
I have a device that will take 4 serial ports and and allow you to connect to them via ethernet.  You assign the device an ip, load the device driver and the ports show up in windows just like real com ports.  This worked great on my XP Pro notebook.  I now have a Win 7 Pro machine.  However I cannot seem to get the ports open.

I have loaded the device driver and windows shows the ports and say they are working correctly.  When I try to open a port with Hyperterminal windows tells Unable to open com 4 please check your port settings.  I get the same result for com 1, 2, 3, 4  which are the ports that show in the device manager.  If I remove the device the results is the same.  If I choose a port that doesn't exist I get the same message.

I have tryed to run Hyperterminal under XP pro and run it as admin, still the same result.

Thanks in Advance for your thoughts.
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Question by:shane0991
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by:Toxacon
ID: 34955072
Try to match port speed, parity, data bits, stop bits and handshake with the original, working config.
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by:Dave Baldwin
ID: 34955408
What is the brand and model of the device?
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Author Comment

by:shane0991
ID: 34955565
I did match everything up.  The device is a Moxa Nport 5410.  The device work perfect in XP Pro.  I am using ther drivers for Windows 7.
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by:Dave Baldwin
ID: 34956174
Check this page http://www.moxa.com/support/faq/faq_detail.aspx?f_id=1293 for port settings in your firewall.  

And on this page http://www.moxa.com/support/faq/faq_detail.aspx?f_id=837 , it says "your Host IP must exist in NPort's access control list".   Did you add the new host IP?
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shane0991 earned 0 total points
ID: 34956533
Hi David,

Yes to both.  I did find the problem just a few minutes ago.  Window 7 Firewall looks like it is not completly off when you turn it off.  I killed it under services and bang started working.

Thanks everyone for your help.
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by:Qlemo
ID: 35221304
This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.
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