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TLS 1.1 will be supported by Salesforce but earlier versions of the FuseIT SFDC Explorer were built on .NET Frameworks that do not support TLS 1.1 and therefore may not connect with Salesforce once TLS 1.0 has been disabled.

Short Term Solution 

Do not accept the Salesforce Critical Upgrade.

Login to your Salesforce instance and navigate to the Setup menu (under your user name). In the search text box search for "Critical Updates". Ensure the "Require TLS 1.1 or higher for HTTPS connections" update is not activated and note the number of days remaining before auto-activation will occur.

Permanent Solution

Please download the latest version of the FuseIT SFDC Explorer. Versions 3.0 onwards use the .NET 4.6.1 framework that has native support for TLS 1.1 and 1.2. If required, you can download the Microsoft .NET Framework 4.6.1.

Required TLS Config

 Note, the securityProtocols element must appear in the FuseIT.SFDC.Explorer.exe.config file to enable TLS 1.2 support.

Code Block
languagexml
linenumberstrue
<configSections>
    <!-- ... -->
    <section name="FuseIT.G4S.SalesforceConnector" type="FuseIT.G4S.SalesforceConnector.SalesforceSettingsSection, FuseIT.G4S.SalesforceConnector" />
    <!-- ... -->
</configSections>

<!-- ... -->

<FuseIT.Sitecore.SalesforceConnector>
    <!-- 
      timeOutMilliseconds: Indicates the time an XML Web service client waits for a synchronous XML Web service request to complete (in milliseconds).      
      clientId: Partner application API token (Case sensitive). Required to work with Professional Edition orgs.      
      uploadBatchSize: The maximum number of records that can be sent to Salesforce in an upload operation. This limit is defined by Salesforce.
    -->
    <binding timeOutMilliseconds="100000" clientId="" uploadBatchSize="200" />
    <!-- Config to explicitly set the System.Net.ServicePointManager.SecurityProtocol -->
    <securityProtocols>
      <securityProtocol securityProtocolType="Tls" />
      <securityProtocol securityProtocolType="Tls11" />
      <securityProtocol securityProtocolType="Tls12" />
    </securityProtocols>
    <!-- Speedup Keyprefix lookups for known values -->
    <keyPrefixes>
      <add key="Lead" value="00Q"/>
      <add key="Contact" value="003"/>
      <add key="User" value="005"/>
      <add key="Organization" value="00D"/>
    </keyPrefixes>
</FuseIT.Sitecore.SalesforceConnector>