![]() ![]() Fiddler 4 must be running on Windows 7+ and the. NET Framework supports the new TLS protocol versions, Fiddler 4 can be configured to use them. NET Framework itself was unable to use the TLS1.1/1.2 support introduced in Windows 7. Fiddler’s behavior derives from the fact that, until version 4.5, the. Fiddler seems to magically “fix” such problems because, by default, it uses only SSL 3.0 and TLS 1.0 when talking to servers, even if the client browser or application attempts connections using the later protocol versions. They were surprised to find that when they attempted to use Fiddler to debug the communication, the connection was instead successful.īack in my old job, I’d encountered many such servers and services, and even wrote a post noting that many servers have compatibility problems with TLS 1.1 and TLS 1.2. ![]() Recently, a Fiddler user contacted me to note that they discovered a client/server application which failed when the TLS version 1.1 option is enabled in Internet Explorer’s Advanced settings.
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