# Black screen within private network

**URL:** <https://openvidu.discourse.group/t/black-screen-within-private-network/2673>\
**Category:** Issues with deployment\
**Tags:** v2\
**Created:** [February 9, 2021, 4:50pm UTC](https://openvidu.discourse.group/t/black-screen-within-private-network/2673 "2021-02-09T16:50:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ChrisAtMyia](https://avatars.discourse-cdn.com/v4/letter/c/858c86/32.png) [@ChrisAtMyia](https://openvidu.discourse.group/u/ChrisAtMyia)\
**Post date:** [February 9, 2021, 4:50pm UTC](https://openvidu.discourse.group/t/black-screen-within-private-network/2673/1 "2021-02-09T16:50:24Z")

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We have an OpenVidu Pro installation set up for use in healthcare. Things were working great until one of our clients tried to make a video call from within the hospital’s private network. The call is connected correctly, but the video is just a black screen.

Could this be an issue with the hospital’s firewall? What ports do I need to ensure are open?

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**Author:** ![vipin\_mishra](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/vipin_mishra/32/32_2.png) [@vipin\_mishra](https://openvidu.discourse.group/u/vipin_mishra)\
**Post date:** [February 10, 2021, 11:36am UTC](https://openvidu.discourse.group/t/black-screen-within-private-network/2673/2 "2021-02-10T11:36:56Z")

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i think this is due to turn detection problem in private network by firewall i seen many times before 2.16.0 but now i thoughts its over can you share logs of console and server  
Thanks