We will develop an APEX web service in Salesforce that we will call from an ERP on premises.
 Do you know what the existing limits within Salesforce are? How many times can we call the Web Service per day?
 

We have a APEX integration that calls out a webservice that runs in a server that only supports TLS 1.0.
The integration is throwing the error: protocol_version in all our sandboxes (our sandboxes are located in servers CS10 and CS11)

Was TLS 1.0 disabled in servers CS10 and CS11? This is supposed to be done only in February 2016.

 

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 '