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Sorry for joining the party a bit late. For future reference, configure replace is your friend: Create a new configuration, and save it on flash:. You probably want to copy over your existing config with TFTP, SCP or similar, make the required change...
Not a helpful answer: The link is not publicly accessible.It *appears* to be a limit on the number of idle TCP connections you can have for Authentication Proxy, going on what my router says when I use the question mark in configuration mode.