# COM Port not free on a PortServerTS

**URL:** <https://forums.digi.com/t/com-port-not-free-on-a-portserverts/16301>\
**Category:** Portserver TS\
**Tags:** port, open\
**Created:** [February 22, 2016, 9:34am UTC](https://forums.digi.com/t/com-port-not-free-on-a-portserverts/16301 "2016-02-22T09:34:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![HPR](https://avatars.discourse-cdn.com/v4/letter/h/db5fbb/32.png) [@HPR](https://forums.digi.com/u/HPR)\
**Post date:** [February 22, 2016, 9:34am UTC](https://forums.digi.com/t/com-port-not-free-on-a-portserverts/16301/1 "2016-02-22T09:34:06Z")

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After some cycles of use (open com / use / close com) the port remains in open state. Only help is to reboot the PortServer over the WEB Interface.  
Version is: 82000747\_W 10/23/2013  
Driver: 4.7.410  
Ser Nr: E51871064

Is this a known issue ?  
Another device works correct.

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**Author:** ![userid0](https://avatars.discourse-cdn.com/v4/letter/u/f6c823/32.png) [@userid0](https://forums.digi.com/u/userid0)\
**Post date:** [February 22, 2016, 9:45am UTC](https://forums.digi.com/t/com-port-not-free-on-a-portserverts/16301/2 "2016-02-22T09:45:19Z")

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This is not a known issue.

If you telnet/SSH to the unit, login as root and issue the “who” command, does it show that the port is in use?

If so, you should see which host has the port open and pursue closing it.

If you are not able to close it from the host computer, you can issue the kill command from the prompt:

#\> kill tty=(port\_number)

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**Author:** ![HPR](https://avatars.discourse-cdn.com/v4/letter/h/db5fbb/32.png) [@HPR](https://forums.digi.com/u/HPR)\
**Post date:** [February 26, 2016, 5:38am UTC](https://forums.digi.com/t/com-port-not-free-on-a-portserverts/16301/3 "2016-02-26T05:38:21Z")

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Telnet works, but it does not show any port in use and also no host which opens the port. Kill command works successful, after that the port is available again. It seems to be only port4 of the device.

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**Author:** ![smartyMARTY](https://avatars.discourse-cdn.com/v4/letter/s/edb3f5/32.png) [@smartyMARTY](https://forums.digi.com/u/smartyMARTY)\
**Post date:** [August 24, 2016, 10:55am UTC](https://forums.digi.com/t/com-port-not-free-on-a-portserverts/16301/4 "2016-08-24T10:55:53Z")

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We are experiencing the same issues with not only the same version, but others as well (82000903\_J3 09/05/2003). This happens when rebooting the system as well.