err_connection_refused

no changes to the server, been running for over a year great, was logged in the WebUI stopped responding so I closed browser and tried to connect again I keep getting ERR_CONNECTION_REFUSED no error in mineos.log and I can log in with putty and WinSCP using the mc account, and when I try to log in with Webmin I get this message, Error - Access denied for 192.168.1.100. The host has been blocked because of too many authentication failures. I have noticed in the past few week slow response from the WebUI.