I have a sandbox on a production system that I've been able to successfully use with the Apex Data Loader and the Eclipse Force IDE for several months.

Today, I can no longer login to my sandbox account with either tool.  I reset my security token, but I still cannot login.  I am able to login to the production system without problems with these tools.  I can also login to the sandbox from the Browser without problems.

Please help!

Thanks,

Dave