It seems that after five or so incoming FTP (or TELNET) connections have been established, other people can connect, but their sessions hang. Is this a MultiNet problem?
You’ve probably hit the default ‘max-servers’ limit. From within SERVER-CONFIG, you can set the maximum number of servers available to service incoming connections. Once that limit (5 by default) has been reached, new connections are accepted, but appear to ‘hang’ until a previously established session ends, freeing up a server. You can boost (or lower) this limit in SERVER-CONFIG by selecting the service you want to modify (e.g., SELECT FTP) and changing the value (e.g., SET MAX-SERVERS 15). Restart the master server for the change to take effect.