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Unable to open com2. Device is already open.

Posted on 1997-06-02
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Last Modified: 2013-12-16
I tried to connect to the Internet without success. I used an external modem connected to com2 port running under windows 3.11.  The error message I got was thet the com2 port was already open, This implied that my com2 port was being accessed by another program. I have no program running that accessed the com2 port except the communication program (I tested the connection using Win 3.11's Terminal program only. ) A quick check using MSD indicated the presence of com2 with the correct IRQ3. A quick test of the com2 port with a mouse connected to it  indicated the com2 port was fine. The com2 port was working okay under Win 3.1 before I updated it to  Win 3.11.

Can anyone provide any hint to my problem?
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Question by:lesoch
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daadams earned 100 total points
ID: 1775624
Ok, lets see if we can unravel this. It seems that you have a IRQ conflict somewhere. I would check and make sure that no other device is using IRQ 3 Your mouse should be on COM 1 IRQ 4 and your modem should be on COM 2, IRQ 3.  Do you have a sound card make sure it is not on IRQ 3. Usually sound cards are on IRQ 5.
I am not sure how a new installation of windows could affect this but it is possible. I hope this is of some help.
                    Allen Adams
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by:lesoch
ID: 1775625
The IRQ was okay. No conflict detected. BTW, I'm using a notebook which used PS-2-like mouse at IRQ 12. The com1 is not used but was tested fine when an external mouse was attached.
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