Perle Systems DS1 - Manual (Page 52)

Configuring the Server
52 IOLAN Device Server User’s Guide, Version 1.0
Services
Services are either daemon or client processes that run on the Device Server. You can disable any of
the services for security reasons. If you disable the DeviceManagerD service, you will not be able to
use DeviceManager to connect to a Device Server.
Password Limit
The number of attempts a user is allowed to enter a password for a port. If this
limit is exceeded, the port is disabled for 5 minutes. A user with Admin level
rights can restart the port, bypassing the timeout, by issuing a kill on the
disabled port. The default value is
3 .
Bypass Password
When set, authorised users who do not have a password set, with the exception
of the Admin user, WILL NOT be prompted for a password at login with Local
Authentication .
Single Telnet
Sets all reverse connections (raw and telnet) to a one connection at a time
mode. Server-side applications will get a (socket) connection refused until:
z All data from previous connections on that serial port has drained
z There are no other connections
z Up to a 1 second interconnection poll timer has expired
This also enables a per-connection keepalive TCP keepalive feature. After
approximately 3 minutes of network connection idle time, the connection will
send a gratuitous ACK to the network peer, thus either ensuring the connection
stays active OR causing a dropped connection condition to be recognised by
the reverse service (all connections).
Applications using Single Telnet need to be aware that there can be some
considerable delay between a network disconnection and the port being
available for the next connection attempt; this is to allow any data sent on prior
connections to be transmitted out of the serial port. Application network retry
logic needs to accommodate this feature. The default value is Off .
Flush On Close
When enabled, deletes any pending data when a port is closed; as opposed to
maintaining the port to send pending data. The default value is Off .
Banner
This parameter concerns the banner information (product name/software
version). This banner information is presented to a user with a login prompt.
For security reasons, you can turn off the display of this information. The
default is Off .
Prompt With Name Displays the
Server Name field value instead of default product name. When
enabled, the Server Name is displayed in the Device Server login prompt, CLI
prompt, WebManager login screen, and the heading of the Menu. The default
value is Off .
TelnetD
Telnet daemon process in the Device Server on port 23.
SPCD
SPC (Trueport) daemon process in the Device Server on port 688.
DeviceManagerD
DeviceManager daemon process in the Device Server. If you disable this
service, you will not be able to connect to the Device Server with the
DeviceManager application. DeviceManagerD listens on port 33812 and sends
on port 33813.
HTTPD
HTTP daemon process in the Device Server on port 80.
SNMPD
SNMP daemon process in the Device Server on port 161.