While dorking on shodan with the SSL filter ( ssl:abc.target.com).

I am not getting your 2nd question, I mean I am unable to read it. But if you are asking about if the server is blocking the request, then yes, the server is partially or improperly blocking the request.

Multiple factors come into scene, but as I don't know the exact mechanism for rate limiting in the target, I can guess that it might be due to Token Bucket mechanism, or it might also be a part of Race Conditions or Improper session management or might be because of bad implementation of IP blocking.