May 20, 2021

"Could not create SSL/TLS secure channel" for Auth0 local development

This is really a post in the category "I have seen this error before, too bad I didn't write something about it the last time I got it". So now I'm writing about it.

I have some super old legacy code, its a mich mach of MVC, ASP.NET Web Forms that I don't care about and it just need to work for another year or so before I migrate some stuff. Today when I was doing some local development I got an error when trying to login to the site.

The request was aborted: Could not create SSL/TLS secure channel.

IOException: IDX20804: Unable to retrieve document from: ''.

InvalidOperationException: IDX20803: Unable to obtain configuration from: ''.

I know this worked just a couple of weeks ago and I suppose it may have something to do with [](Auth0 upgrade to TLS 1.2) but again, I don't care about this code and it works in prod so I haven't spent so much time digging into it.

Anyway, I found this [](question on Stack Overflow) and adding this to my Startup -> Configuration seems to have resolved the issue. I suppose it explicitly add support for higher versions of TLS or something. I don't know and I don't care.

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
| SecurityProtocolType.Tls11
| SecurityProtocolType.Tls12
| SecurityProtocolType.Ssl3;
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