# Zoom windows sdk connection failure

**URL:** <https://devforum.zoom.us/t/zoom-windows-sdk-connection-failure/54406>\
**Category:** Windows\
**Created:** [July 19, 2021, 9:32pm UTC](https://devforum.zoom.us/t/zoom-windows-sdk-connection-failure/54406 "2021-07-19T21:32:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![guowei.shieh](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/guowei.shieh/32/29314_2.png) [@guowei.shieh](https://devforum.zoom.us/u/guowei.shieh)\
**Post date:** [July 19, 2021, 9:32pm UTC](https://devforum.zoom.us/t/zoom-windows-sdk-connection-failure/54406/1 "2021-07-19T21:32:29Z")

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**Description**  
Starting from 7/18 15:00 PST, we’re seeing a lot of zoom sdk connection failures

The log we see is the following (in reverse time order)

2021-07-19, 19:19:47.021173 | 0x0000c064 - Meeting status: 7, result: 0  
2021-07-19, 19:19:47.021173 | 0x0000c064 - Meeting status: 6, result: 505  
2021-07-19, 19:19:47.021173 | 0x0000c064 - Meeting status: 4, result: 0

It seems that the bot was disconnected (4), and then got a connection failure (6) with error code 505. and the meeting just ended.

**Which Windows Client SDK version?**  
v5.2.42037.1112

**To Reproduce(If applicable)**  
Steps to reproduce the behavior:

1. Go to ‘…’
2. Click on ‘…’
3. Scroll down to ‘…’
4. See error

**Screenshots**  
If applicable, add screenshots to help explain your problem.

**Device (please complete the following information):**

- Device: [e.g. Dell XPS 13]
- OS: [e.g. Windows 10]

**Additional context**  
Add any other context about the problem here.

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<div class="post-metadata">

**Author:** ![Michael\_Condon](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/michael_condon/32/13543_2.png) [@Michael\_Condon](https://devforum.zoom.us/u/Michael_Condon)\
**Post date:** [July 20, 2021, 4:58pm UTC](https://devforum.zoom.us/t/zoom-windows-sdk-connection-failure/54406/2 "2021-07-20T16:58:58Z")

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Hey @guowei.shieh,

Thanks for using the dev forum!

Are you using ZAK tokens to start your meetings? If so, are you caching are re-using the tokens?

Thanks!  
Michael

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [August 20, 2021, 2:59am UTC](https://devforum.zoom.us/t/zoom-windows-sdk-connection-failure/54406/3 "2021-08-20T02:59:50Z")

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Closed on August 20, 2021, 2:59am UTC

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