Sentence structure: Can I not try that?

Does the sentence "Can I not try that?" mean:

  1. I want to try that but I'm not allowed to
  2. I don't want to try that

"Can I try that?" would be a simple question. "Am I allowed to try to do something?" Modifying try with "not" implies a slight fear that permitting the action might violate a formal or informal rule, or that the requester might lack the ability to successfully perform the action.