The following points must be borne in mind when you start up or shut down servers:
The START-FTP-DEMON command is only effective if the SYSENT.TCP-IP-AP.nnn.FTPD start procedure exists.
If the commands are entered at the console they must also be shareable. This has no negative effect on security since from TCP-IP-AP V5.0 on all server options can be stored in a separate option file which does not need to be shareable (see the section “Configuring FTP via the option file”).
The VERSION parameter in the START commands also permits servers withTCP-IP-AP Versions < 5.0 to be started. However, as the servers only log on to the TCPIPAP subsystem after every start as of V5.0, only such servers can be shut down again using the STOP command.
A maximum of 20 users can be connected to the TCPIPAP subsystem. No more FTP/Telnet-Server-Instances are permitted owing to the size of internal tables. In practice the maximum number of 20 is, however, sufficient. If the maximum number is exceeded, the server shuts down on startup and issues the following message:
"error: too many connections to Subsystem TCPIPAP"If the server was not started under TSOS it shuts down and issues the following message:
"error: no privilege to connect to Subsystem TCPIPAP"This can only occur if you attempt to start the server by calling the start procedure explicitly instead of using the START-...-DEMON command, because this would be rejected under an ID other than TSOS.