If you haven't read my previous post regarding how to resolve the "Report Server is unavailable", please read it here. The article provide step by step procedure to check your Actuate server temp folder.
Sometimes the basic solution is really a simple task and we forget to apply a simple solution. I have the same scenario, the server is working properly and for no reason it stop printing reports again.
Well to make the story short, I've checked my server drive C and D disk space. The drive D is plenty of space to write, close to 100Gb. The drive C is close to 500Mb only but still plenty of space to write. I decided to delete old installer files, temp files, internet temporary files and other junks in drive C. It turns out, another 2GB+ more disk space for my drive C. I've check the printing of report, it works.
I don't know the exact disk space needed for the Actuate Report Server to run but I will keep this in mind.
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EM @ KING.NET