Perle Systems SCS8C DC User Manual

 257

Services

Services are either daemon or client processes that run on the IOLAN. You can disable any of the 
services for security reasons. 

If you disable any of the daemons, it can affect how the IOLAN can be used or accessed. For 
example, if you disable WebManager (HTTPS and HTTP) services, you will not be able to access the 
IOLAN with the WebManager. If you disable the DeviceManager service, the DeviceManager will 
not be able to connect to the IOLAN. If you do not want to allow users to Telnet to the IOLAN, you 
can disable the Telnet Server service; therefore, disabling daemons can also be used as an added 
security method for accessing the IOLAN.
By default, all daemon and client applications are enabled, except IPsec, and running on the IOLAN.

Enable/disable the following options:

Telnet daemon process in the IOLAN listening on TCP port 23. 
Default: Enabled

The TruePort daemon process in the IOLAN that supports TruePort Full Mode 
on UDP port 668. You can still communicate with the IOLAN in Lite Mode 

when this service is disabled.
Default: Enabled

Syslog client process in the IOLAN.
Default: Enabled

Modbus daemon process in the IOLAN listening on port 502. 
Default: Enabled

SNMP daemon process in the IOLAN listening on UDP port 161 and sending 

traps on UDP port 162. 
Default: Enabled