What happened to the com port?

By lehmag ยท 4 replies
Jun 7, 2007
  1. Has anyone encountered a problem when you look at the com ports under Device Manager the port you are using for your dial up modem doesn't show up? A neighbor of mine is having an issue where she can dial out and it looks like it connects..but she can't ping anything or connect to any websites. I can't find the com port under the device manager and the troubleshooter said there might be something wrong with it.

    Any help would be appreciated.

  2. Ididmyc600

    Ididmyc600 TechSpot Chancellor Posts: 1,415

    Hi Lehmag

    Disappearing comports !! yep see it a lot in XP (but you failed to state which OS it is), except the other way round that is they show in Device Manager but the com port doesnt work, I usually just remove them under device manager and reboot, however you say they dont show in device manager which is strange, first thing I would do is to reboot the PC and go into the BIOS and see if they are turned on correctly in the BIOS, it may be possible that the system BIOS may have reset to default and the com ports are turned off,

    But if the com port is missing then the modem wouldnt find the port and dial out, however you say it seems as though the modem connects, can you verify this at all, ive never used a dial up connection on XP so i'm not sure how you could verify it, im sure someone may have a better idea.

    There are a couple of checks you can try

    Click Start > run > cmd > enter
    mode com1 and press enter, it should reply with a list of the port details.

    If you get a reply saying invalid port or port not available then there is a problem with the port, or something has opened the port, reboot the PC and as you see the splash screen for XP press F8 and choose safe mode, when logged in try the same command and see what you get.

    Its all I can think of for now.

  3. lehmag

    lehmag TS Rookie Topic Starter

    Sorry yes it is XP. I will try what you suggest.

  4. Daveskater

    Daveskater Banned Posts: 1,687

    you could verify if the modem is connected by dialing up and then picking up your telephone handset, if it's the same as the uk where you are then you should hear noises instead of the dial tone thing
  5. lehmag

    lehmag TS Rookie Topic Starter

    Well verified all this stuff and then changed the modem to a different port and even tried a different modem. Nothing worked. So its pointing more and more to the machine itself. Possibly a software issue.
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