Sharing a link = timeout

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Hello,
I have an intranet (all users need to login to view pages) and it's been working great for over two months now.
When users send to each other a link via email, the recipient cannot access the linked page unless he's already logged in. The problem is that they are not always re-directed to the login page - instead the target page tries to load for ages and then they receive a timeout message.
Is there a way around this?

Thank you,
Dafni

dimidola