We have a 2003 Server that hosts an FTP site for some outside internet users, through IIS, which has been working fine for a while, until recently. It's now inconsistently allowing the users onto the machine, and when it has trouble, none of the normal FTP users are able to authenticate and get access - unless the server is rebooted - at which point it works again. The errors I'm seeing are:
(On FTP Server) SYSTEM LOG - MSFTPSVC - EVENT 100: The server was unable to logon the Windows NT account 'lacoinc1\dgardner' due to the following error: There are currently no logon servers available to service the logon request.
(From web browser session of the user) "Alert: 530 User (username) cannot log in"
This happens with even an administrator account as well. Also, it's not long after a server reboot that it begins to fail again. The only thinig that has changed on this machine is it used to be a domain controller machine, and was DCPROM demoted down to a member server, successfully. The machine logs on normally to the network and all applications (except this FTP issue) seem to be working normally. Not sure what's going on, and more curiously, WHY it's inconsistently letting users authenticate like this.
Thanks for any help.
attached please find a text listing of the application log, in case it helps.