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TLS 1.3 Not Supported for DataSources? - TLS 1.3 fails, but TLS 1.2 passes for JSON datasource
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nicademus  
#1 Posted : Monday, April 20, 2026 3:32:56 PM(UTC)
nicademus

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We have a New API we have built to act as a Datasource via JSON in Vmix - using 29.0.0.46 right now. However when we use the HTTPS address of our server it fails with an SSL/TLS negotiation error. WE have nailed this down to the fact our Firewall WAF was set to enforce TLS 1.3 - as it does this for extra security for ALL of our internal Web servers. However this is when we get the error. I temporarily changed the Global value to TLS 1.2 Capabale - and the JSON source works with HTTPS.

This is not ideal - so wondering if there is some tweak somewhere we can force VMIX to try TLS 1.3? or is it something you still need to Bake into the Code for support.
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NiBTour  
#2 Posted : Tuesday, May 26, 2026 8:48:33 PM(UTC)
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What OS are you on? Win10 or Win11? if you're on Win11 you can try adding this to the vm config file:

<runtime>
<AppContextSwitchOverrides value="Switch.System.Net.DontEnableSystemDefaultTlsVersions=false"/>
</runtime>

I believe it already has a runtime section so just find it and put the config line in there.

If your on win10 you'll need to do a registry change like so:

Find the following path in the left panel of the Registry Editor:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.3\Client]
Double-click on [Enabled].
In the [Value data] field, change the value to [1] and click [OK].

Obviously test this but this should work for you.
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