My REST API calls to Salesforce work through RunScope (an API debugging site) but not directly to Salesforce

Question

So right now I'm trying to make a bunch of REST API calls to Salesforce from my WebSphere server, but every time I make a request, I get a "500 Server Error" error message in my logs. I then tried to run my API calls through RunScope to try and debug what was going wrong. As soon as I sent my API calls through RunScope to Salesforce, the 500 Error went away and everything worked. I instantly thought it was some kind of SSL Protocol issue since Salesforce apparently doesn't support SSL3.0. So I checked my WebSphere configuration and noticed that it supports both SSL and TLS protocols (I'm not 100% sure which protocol it's using though, if anyone knows of a way to test that, that would be helpful). Now I'm pretty stumped. I know it's not a certificate issue because i installed the needed certificates on my WebSphere server. Anyone else have any ideas why the API calls work through RunScope to Salesforce but not directly to Salesforce? Any help is appreciated.

Answer 1

I figured it out. My issue was that my WebSphere server was running TLS1.0 which isn't supported anymore by Salesforce. If you're running into the same issues as me, make sure your server is running TLS 1.1 or higher.