As others have said the how you vote is up to you. No one is going to take away your privilege for voting in a way that is not beneficial to the site.
That said, the community benefits most when you use your voting power to reward good questions and answers with up-votes and penalize BAD questions answers with down votes.
In this case that answer is a bad answer. If you are able to read that answer and say duh, of course I forgot to close my streams, and then fix your problem it may be a good answer. But answer that is not complete is a bad answer. You had to go search for more information so this was not a good answer.
Go somewhere else and search for X should never be an acceptable answer here. We want people coming to the SE network to find their answers. If you have to do further searching to find your answer then no it is not a good answer. This answer was not directly a go search somewhere else answer, but it might as well have been for you.
If the answer already exists here pointing them to that answer is appropriate. Linking to outside resources to provide a reference is a good thing, but the answer should also never be link only. At a bare minimum quote the pertinent information from the referenced page so should that page be moved the information still exists in our network.
In this case if you feel that the answer led you to find the right answer, then you may not want to down vote it. But I would not reward it with an up vote either. I would post a new answer with the information you found that does answer the question. In this way you can help a future reader by putting the information directly at their fingertips which is the goal of the SE network in the first place.