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MandMMandM 

System.CalloutException: Received fatal alert: protocol_version

I am having a hard time find documentation for what protocol(s) and version(s) I can use on a DMZ server so I can all into our local API from a Salesforce server.

Does have any information on this? Currently when I call into our API, I receive 'system.CalloutException: Received fatal alert: protocol_version '
MandMMandM
So it looks like the handshake from Salesforce is SSLv2 , can we force TLS?
Administrateur ApplicationsAdministrateur Applications
Hi,
Have you found a solution? I'm getting the same problem when I call a webservice from all the SalesForce Sandboxes. If I call it from production, I have no problem at all.
MandMMandM
We ended up using SSL in a proxy server and then wrapping the request in TLS and passing it along. Although since this post, we can now use TLS 1.2 for the whole process and have removed the proxy. 

I find it odd that your sandbox is using different protocol versions then production.