mersenneforum.org Possible fix, with just some registry keys added?
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 2021-07-10, 16:47 #1 Madpoo Serpentine Vermin Jar     Jul 2014 3,313 Posts Possible fix, with just some registry keys added? I was reading more about this issue with Framework 4.0 apps and TLS 1.2 support. If the machine has Framework 4.5+ installed, then it sounds like you can tell it to use TLS 1.2 by default with the addition/modification of a couple of registry keys. This avoids having to recompile an old app, since you're just telling your framework to use a stronger crypto by default. If someone wants to try this out - just make sure your system does already have 4.5 installed. Windows 10 does, by default, so that should be fine. For older systems (Win7/8/8.1) just be sure to check. From an admin command prompt (or add the keys to the registry yourself if you're so inclined): Code: reg add HKLM\SOFTWARE\Microsoft\.NETFramework\v4.0.30319 /v SchUseStrongCrypto /t REG_DWORD /d 1 /f reg add HKLM\SOFTWARE\Microsoft\.NETFramework\v4.0.30319 /v SystemDefaultTlsVersions /t REG_DWORD /d 1 /f Those commands add the reg entries that will tell .NET Framework 4.x targeted apps to use stronger crypto by default. I saw conflicting info about whether you actually need Framework 4.6+ installed, or if 4.5 is good enough. If getting 4.6+ installed and adding some reg keys does the trick, I'd be on board with just recommending that for any misfit users, over the downside of re-enabling the older protocol versions.
 2021-07-28, 16:45 #2 Madpoo Serpentine Vermin Jar     Jul 2014 3,313 Posts Thanks for the sticky on this. Hopefully it's still working for people.

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