HELP! System cannot open COM Port

 
     I am running Windows NT 4.0 with SP5.  It is a relatively new install.  However, when I finally got around to using my modem, I ran into a particular problem.  Certain programs could use my modem fine, such as Network Dial-Up, Hyperterminal, Winfax Pro.  But other programs, like Telix, or Searchlight BBS (I tried both the DOS, and the 32bit Windows version) would generate the following error:

     "The system cannot open COM1 port requested by the       application"  and it gave me the option to Terminate       or Ignore.

     I have used these very same programs in the past with the same version of NT, without a problem.  I tried reinstalling NT and attempting the programs both before and after I patched it with no success.  Does anyone know what causes this, and how I can correct it?  Thanks!


                                                               Ocean
OceanAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

gothickCommented:
That error message would normally indicate that the COM1 port is already in use by another application.  Does it do that if the offending program is the first thing you run after a re-boot?
0
benstockCommented:
Stop the RAS Services and see if that helps you ti run the other apps.
0
ddmorganCommented:
first check all of your serial port options in control panel... but remember that NT does not like for apps to interact with the hardware above it's self,, after checking and verifing the port settings check all services that are running and make sure they do not have the com ports tied up..
0
OWASP: Threats Fundamentals

Learn the top ten threats that are present in modern web-application development and how to protect your business from them.

sargon99Commented:
take benstops answer and disable RAS that has fixed that problem for me several times.
0
Jason_SCommented:
What other COM ports are on the system?  More specificaly, do you have a device using COM3?  If so, it is probably attempting to share IRQ4, thus causing the problem.  Some software, and hardware have problems with sharing resources.  You could move the modem to COM 2, and give that a try.
0
OceanAuthor Commented:

     Thank you!  Thank you all for your help.  One of the suggestions did it.  Stopping the RAS service fixed the issue.  My remaining question is this:  What *exactly* does RAS handle?  I need to know what the possible consequences are of my disabling this service.  I do dial out to an ISP, and I do use other Windows telecommunication programs like WinFax Pro.  

     Thank you again for your help!



                                                     ocean
0
benstockCommented:
I'll post as answer as I was the first to suggest.
And the RAS Service will deal withh incoming dial up requests.  Set the service to Manual startup and you should suffer no ill effects.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
MoondancerCommented:
This question was awarded, but never cleared due to the JSP-500 errors of that time.  It was "stuck" against userID -1 versus the intended expert whom you awarded.  This corrects the problem and the expert will now receive these points; points verified.

Please click on your Member Profile and select "View Question History" to navigate through any open or locked questions you may have to update and finalize them.  If you are an EE Pro user, you can also choose Power Search to find all your open questions.

This is the Community Support link, if help is needed, along with the link to All Topics which reflects many TAs recently added.

http://www.experts-exchange.com/jsp/qList.jsp?ta=commspt
http://www.experts-exchange.com/jsp/zonesAll.jsp
 
Thank you,
Moondancer
Moderator @ Experts Exchange
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows OS

From novice to tech pro — start learning today.