# Unhelpful message on port open failure

**URL:** https://forum.sierrawireless.com/t/unhelpful-message-on-port-open-failure/4833
**Category:** Development tools
**Created:** [January 17, 2011, 2:01pm UTC](https://forum.sierrawireless.com/t/unhelpful-message-on-port-open-failure/4833 "2011-01-17T14:01:03Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)
#### Post date: [January 17, 2011, 2:01pm UTC](https://forum.sierrawireless.com/t/unhelpful-message-on-port-open-failure/4833/1 "2011-01-17T14:01:03Z")

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![](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/6/6ada8b18d92472c7588a2117ed2184a81ea592f8.gif)  
  
What it means is that the COM port is already in use by another Windows application; but I think that’s highly ambiguous here - “Application” could easily be taken to refer to the embedded Open-AT application!

Also, in this particular case, the application i [/i]should not be “unknown” at all - it was Selima!

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### Author: ![daav](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/daav/32/2767_2.png) [@daav](https://forum.sierrawireless.com/u/daav)
#### Post date: [January 18, 2011, 7:57am UTC](https://forum.sierrawireless.com/t/unhelpful-message-on-port-open-failure/4833/2 "2011-01-18T07:57:44Z")

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ok, point logged for fix.