No, that's a hard limit. FMS12 however has 200 of them.
Info on why your databases close should be in the event.log. I would urge you to look at that closely because databases closing on the server is a sign of big trouble... I doubt it has to do with the # of web users.
Thank you for the answer. Seems that I have to upgrade to FMS12, because the event.log tells that the limit(100) is reached.
This can often be a sign of a slow response to a request... are there any pages which load extremely slow? Could be the result of searching on an un-indexed field, or a related field... or sorting a large result set.
The 100 connection limit is actually a lot more than other servers, but you also might look at fast hard drive for the server or adding more RAM for faster response if the load warrants it.
In addition to the previous comment, see if the database file is set to automatically sort records upon opening and make a change if it is. This will cause some issues with large amounts of data with as many users changing tables.