# incorrect com port numbering

**URL:** <https://forums.digi.com/t/incorrect-com-port-numbering/7552>\
**Category:** USB Devices\
**Created:** [October 13, 2006, 1:43pm UTC](https://forums.digi.com/t/incorrect-com-port-numbering/7552 "2006-10-13T13:43:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![rdstone](https://avatars.discourse-cdn.com/v4/letter/r/e5b9ba/32.png) [@rdstone](https://forums.digi.com/u/rdstone)\
**Post date:** [October 13, 2006, 1:43pm UTC](https://forums.digi.com/t/incorrect-com-port-numbering/7552/1 "2006-10-13T13:43:40Z")

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I have two (supposedly) identical servers running Windows 2003 server. When I put my Digi Acceleport card in one box the 16 ports show up correctly as ports 3 thru 18. When I put the same card with the same driver in my second machine, the ports show up as ports 19 thru 34.

Please advise.

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**Author:** ![michaelt](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/michaelt/32/92_2.png) [@michaelt](https://forums.digi.com/u/michaelt)\
**Post date:** [October 13, 2006, 2:20pm UTC](https://forums.digi.com/t/incorrect-com-port-numbering/7552/2 "2006-10-13T14:20:57Z")

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The numbering of com ports is not a default, its a number based on whatever com ports are already in use on the server where the serial card is being installed. So, on the second machine I believe that ports less than 19 are already in use, or possibly still exist in the registry due to a previous install. If you’re able to free up com ports lower than 19 on the second server, you’ll be able to re-number the Digi com ports to use those unused/freed-up com ports.

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**Author:** ![User38](https://avatars.discourse-cdn.com/v4/letter/u/ba8739/32.png) [@User38](https://forums.digi.com/u/User38)\
**Post date:** [October 13, 2006, 2:25pm UTC](https://forums.digi.com/t/incorrect-com-port-numbering/7552/3 "2006-10-13T14:25:10Z")

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Michaelt’s reply is correct. Here is a link to an article about how to remove these “phantom” ports in Windows Xp, but, the same steps can be used in Windows Server 2003:  
[http://www.digi.com/support/kbaseresultdetl.jsp?id=274](http://www.digi.com/support/kbaseresultdetl.jsp?id=274)

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**Author:** ![rdstone](https://avatars.discourse-cdn.com/v4/letter/r/e5b9ba/32.png) [@rdstone](https://forums.digi.com/u/rdstone)\
**Post date:** [October 13, 2006, 4:42pm UTC](https://forums.digi.com/t/incorrect-com-port-numbering/7552/4 "2006-10-13T16:42:47Z")

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Worked like a charm. thanks