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The problem occurs only when I update the version of flutter. The version before: 2.5.3 The current version: 2.10.3

JIMMY VICENTE
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1 Answers1

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I know this is a relatively old question, but I've had this issue lately. In my case, it was a TLS version problem.

I was trying to add SSL to my IIS server. The thing that solved it for me, was looking on Postman at the TLS version. In my case, as the IIS was a bit downgraded, it was TLS v1.0.

I found that TLS versions 1.0 and 1.1 were considered outdated by Microsoft and some other big companies. Once I managed to get my TLS up to 1.2, Flutter accepted the connection immediately.

FMorschel
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