Where do I find the Server Host URL for Data Loader?

[RCNolt]

I am getting a "Failed to send request to..." error when logging into Data Loader.  I'm assuming it has something to do with the Server Host option in the Data Loader settings, but I'm not able to find the URL that should be put in there.

Thanks for any help! 

[RCNolt]

No one knows anything about this??

[DarrellD]

It should be blank for Production loads/extracts.  If Sandbox, then test.salesforce.com.  So if it's blank and you are getting that error, not sure why.  But if you change it, you have to logout or close the Data Loader, then open it again and login.  You can't just remove the URL or add the Sandbox and continue with DL open.