Forum OpenACS Q&A: Re: Re: OpenACS Installation. Configuring AOLServer
By suddenly do you happen to mean the first time you restarted since last Saturday (May 13, 2006)? If so, you're almost certainly experiencing a Y2038 problem.
This thread on the AOLserver Developers List talks about it. Solution: change the MaxIdle and MaxOpen settings in your config file to be 0 instead of 1000000000 (1 billion).