The link to the Forums from the main page Community > Forums link appears to be stuck on the Maintenance page.
Basically, the link takes you to
http://forums.startrekonline.com/ which has the maintenance message.
However, if you go to
http://forums.startrekonline.com/index.php you are currently able to access the full forums no problem.
Comments
its just your internet is remembering the old page instead of the new one
i had the same issue but i did a quick clear out and now it works, as both your links take me to the forum page