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What would a user who wasn't logged in see if they visited it? Depending upon your company, I would suggest exposing the knowledgebase, that could possibly rank for people looking to solve problems that your products would help with. Same with the forum. If you chose to do that, you might be better off simply moving that content to somewhere else in your site structure. For everything else, Google wouldn't typically be able to login, and what would you actually show it? It's not a customer, so it would have any tickets or products to list serial numbers of. You could detect that it's GoogleBot and show something else, but that's very bad practice!