# Issues trying to connect to CloudXR server 0x800831F4

**URL:** <https://forums.developer.nvidia.com/t/issues-trying-to-connect-to-cloudxr-server-0x800831f4/209233>\
**Category:** CloudXR (VR and AR Streaming)\
**Created:** [March 23, 2022, 5:40pm UTC](https://forums.developer.nvidia.com/t/issues-trying-to-connect-to-cloudxr-server-0x800831f4/209233 "2022-03-23T17:40:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ay.ri](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@ay.ri](https://forums.developer.nvidia.com/u/ay.ri)\
**Post date:** [March 23, 2022, 5:40pm UTC](https://forums.developer.nvidia.com/t/issues-trying-to-connect-to-cloudxr-server-0x800831f4/209233/1 "2022-03-23T17:40:54Z")

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Hi, new to CloudXR, I am blocked at the beginning without being able to connect to the server (steamVR is waiting for headset to be pluged-in and never see cloudxr icons on the server side (logs from 18.29.50). If I run TestServer.exe on the VM and then launch the client app I get a client disconnected (logs from 18.34.35)

My setup:  
-connecting to a VM through VMWare Horizon Client, where I had steamVR and CloudXR Server successfully installed.  
-using the client for windows with an htc vive.

I suspect I have network issues, I just do not realize what’s the real problem.  
I checked version of client/server as suggested in thread: [CloudXR - some computers give extended black screen?](https://forums.developer.nvidia.com/t/cloudxr-some-computers-give-extended-black-screen/196980), but everything seems ok, running v3.1.1.1 on both sides  
I also tried opening port 48010 (mentioned in log)

Any ideas on how to make it work?  
Thanks

[CloudXR Client Log 2022-03-23 18.29.50.txt](https://forums.developer.nvidia.com/uploads/short-url/uYZGMg1akx0vNXjVNUig3JKfevJ.txt) (1.8 KB)  
[Streamer Client Log 2022-03-23 18.29.50.txt](https://forums.developer.nvidia.com/uploads/short-url/zWRj3kvppJ3snJdm4fdyzZ9vvrD.txt) (12.4 KB)  
[CloudXR Client Log 2022-03-23 18.34.35.txt](https://forums.developer.nvidia.com/uploads/short-url/cD80831YPyFtKpSx41tVSh2iKpH.txt) (985 Bytes)  
[Streamer Client Log 2022-03-23 18.34.35.txt](https://forums.developer.nvidia.com/uploads/short-url/vZoGrTWhRNESZThejC14ahTZ4Vp.txt) (13.6 KB)

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<div class="post-metadata">

**Author:** ![NuShrike1](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@NuShrike1](https://forums.developer.nvidia.com/u/NuShrike1)\
**Post date:** [March 24, 2022, 12:22am UTC](https://forums.developer.nvidia.com/t/issues-trying-to-connect-to-cloudxr-server-0x800831f4/209233/2 "2022-03-24T00:22:26Z")

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Looks like firewall issues between your client and server?  
“ConnectCommon failed, reason : Could not establish a connection to the server [cxrError\_Could\_Not\_Connect\_To\_Server]”

In our lab-setup, previously experienced McAfee blocking ports when Windows Firewall was properly configured.

You may need to manually set up port forwarding/configuration for your VM. There’s more than one port involved.

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**Author:** ![ay.ri](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@ay.ri](https://forums.developer.nvidia.com/u/ay.ri)\
**Post date:** [March 24, 2022, 8:27am UTC](https://forums.developer.nvidia.com/t/issues-trying-to-connect-to-cloudxr-server-0x800831f4/209233/3 "2022-03-24T08:27:22Z")

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Thanks for your answer, indeed, I agree I have something blocking connections, but I cannot find a detailed guide on ports and rules to add to make it work, any help there? Thanks.

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<div class="post-metadata">

**Author:** ![NuShrike1](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@NuShrike1](https://forums.developer.nvidia.com/u/NuShrike1)\
**Post date:** [March 25, 2022, 5:21pm UTC](https://forums.developer.nvidia.com/t/issues-trying-to-connect-to-cloudxr-server-0x800831f4/209233/4 "2022-03-25T17:21:20Z")

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Check the settings on the Windows Defender Firewall “Inbound Rules” (after CloudXR server is installed) should be the best reference.

![CXR firewall](https://global.discourse-cdn.com/nvidia/original/3X/2/2/2252c74b784cb09f97134cfe19d8be652c2a2b4e.png)

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**Author:** ![shad.williams](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@shad.williams](https://forums.developer.nvidia.com/u/shad.williams)\
**Post date:** [March 28, 2022, 3:10pm UTC](https://forums.developer.nvidia.com/t/issues-trying-to-connect-to-cloudxr-server-0x800831f4/209233/5 "2022-03-28T15:10:42Z")

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Which display protocol are you using with Horizon? I could not get it to work with Blast but it does work with PCoIP.