The error you have mentioned looks like a network issue to me. Whenever I get such error, it is generally because my RMI host configuration is incorrect. So, I check my RMI host configuration and refer this [article.](https://community.denodo.com/kb/view/document/RMI%20host%20configuration?category=Operation)
For more information, please refer to the previously answered community question [here.](https://community.denodo.com/answers/question/details?questionId=9060g000000XdQJAA0&title=Connection+error%3AConnection+timedout+connect)
Hope this helps!