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DUN problem "modem is being used.."

Posted on 1997-06-26
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Last Modified: 2013-12-16
My dial up connecion has been working fine for months.Without making any changes to anything I am aware of I suddenly got a DUN message

"The modem is being used by aanother Dial-up Networking connection or another program . Disconnect the other connection or close the program and try again."

I have tried
- control/alt/del to eliminate any programs running
-physically removed and reinstalled the modem
-checked for conflicts thru control panel
-deleted and reinstalled the modem and serial ports both auto and manual installs.

Any suggestions would be appreciated

-chris
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Question by:clee2
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7 Comments
 
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Accepted Solution

by:
wwillis earned 200 total points
ID: 1748991
Boot "safe mode command prompt only" and see if you can echo the com port the modem is on. If it is on com1 for instance you would type:
echo ata > com1
    if the modem is responding correctly at that point it should go offhook and start making the handshaking noises. If it does type:   echo ath > com1  which will hang it up.  If that doesn't work you are having a problem with the modem that exists at the BIOS level (may try disabling the serial ports in CMOS setup if it is an internal modem) or a hardware failure with the modem itself.  If it does work then you know for sure it's a Windows problem. At that point cd \windows\system and type: ren telephon.cp$ telephon.cpl   and hit enter, then type: tapiini  ...this will recreate the telephon.ini file in case for some reason it got corrupted.  reboot back into Windows and test the modem. if it works, great, it was probably telephon.ini ...if not go to control panel. You should now have an icon for Telephony after renaming the .cpl file.  Go into telephony and make sure Unimodem service provider is listed first. Sometimes some 16-bit service provider (old versions of AOL or Compuserve can hose this) will put itself first and that will stop all 32-bit communication (DUN and hyperterminal).  If Unimodem isn't first there is an option there to change the order (can't remember precisely what the button says) and that should fix it. Good luck!

      <--Will-->
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Author Comment

by:clee2
ID: 1748992
I performed all of the preceeding tests of modem etc. per your instructions without success. I have also tried deleting and reinstalling the modem with the standard driver as awell as Supra 288i pnp driver (latest from Diamond). D & R the dial up adaptor, protocols etc. without any change.
?????
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LVL 1

Expert Comment

by:wwillis
ID: 1748993
If the echo test did NOT work and your modem does have a UART chip (i.e. is not a cheap Windows ONLY modem) then your modem is shot and you should probably give tech support a call and have it replaced.  If the modem doesn't respond to
echo ata > com1   from an F8 boot to Safe Mode Command prompt Only it will NOT work inside of Win95.   Any lightning storms recently?  We had a couple of nasty storms here in Dallas in the last couple of weeks, one fried my cordless phone and two of my co-workers lost modems to lightning coming through the phone lines.  Just a thought, but it definitely sounds like a hardware failure at this point.

     <--Will-->  MCSE, A+ Certified Technician
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Author Comment

by:clee2
ID: 1748994
Sorry for being unclear, I meant tnat the modem tested fine, and I made the changes as you suggest but still have the same DUN message. Is there any way to determine what app(s) DUN thinks are using the modem?
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Author Comment

by:clee2
ID: 1748995
Adjusted points to 200
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LVL 1

Expert Comment

by:wwillis
ID: 1748996
If you right click on your DUN connection and click properties, then go to the connect using (where it shows what modem you are dialing with) and hit the down arrow does it show more than one modem?  Maybe like Supra 288i PNP  and Supra
288i PNP #2  ?   If so you may try selecting the other modem.  My USR 56K modem was doing that to me this weekend, I finally had to select #2 to get it to pick up and dial, if I left it on the original it would give the same error you are getting about the modem being in use by another dialup connection.  If that isn't the case try reinstalling Win95 over the top of itself, your program settings won't be hurt and it may fix whatever the glitch is that makes the system think you have another active modem when you don't.  Good luck.

     <--Will-->
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Author Comment

by:clee2
ID: 1748997
I tried exactly that so that there was two modems showing and set up new connections with each of them, no luck. So..... breakout the diskettes!
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