326 DSView 3 Software Installer/User Guide
Appendix B: TCP and UDP Ports
The DSView 3 software client accesses the server and performs commands using a standard web
browser. The communication protocol used between the client web browser and the server is the
HTTPS protocol. By default, TCP/IP port 443 is used for HTTPS connections, but you may change
the port using the DSView Server Network Properties window.
NOTE: The port used for the HTTPS connection may be changed using the DSView Server Network Properties
window. The HTTPS port must be specified in the web browser URL if changed from the default (port 443). See
Server Properties on page 55.
DSView 3 software clients may communicate with the DSView 3 server through a standard
connection or using a proxy server. By default, TCP/IP port 1078 is used for proxied connections.
If a proxy connection has not been created, TCP ports 22, 2068 and 8192 must be configured as
open on your firewall.
When data logging is used, the SSH server port, 4122, and the Syslog server port, 4154, must be
configured as open on your firewall.
NOTE: You can change the SSH server port and Syslog server port. See Enabling and disabling the SSH server
on page 169 and Enabling and disabling the Syslog server on page 169.

KVM switch ports

A user may initiate a KVM session with a target device on a KVM switch by clicking KVM Session
for the appropriate target device or by clicking the KVM Session icon or text from a Unit
Overview window.
The client contacts the DSView 3 server, which checks the permissions of the target device. If the
logged in user has permissions to establish Video Viewer sessions to the selected target device, the
server will establish a connection to the KVM switch using TCP/IP port 3871 to authorize the
session. The KVM data is sent to the KVM switch using ports 8192 and 3871. Port 8192 contains
the video portion of the KVM data. Port 2068 contains the keyboard and mouse portion of the
KVM data.
In a non-proxied connection, the video data from port 8192 and the keyboard and mouse data from
port 2068 are sent directly from the client to the KVM switch. Figure B.1 illustrates the ports used
with a non-proxied KVM switch connection.
UDP port 3211 is used by the DSView 3 server to initialize the IP configuration of KVM switches.
TCP/IP port 3211 is also used by the DSView 3 server to perform management functions on KVM
switches, such as configuring settings.
NOTE: When using a non-proxied connection, video performance over a slower network connection may be less
than optimal. Since certain color settings (such as grayscale) use less network bandwidth than others (such as
Best Color), changing the color settings may increase video performance. For optimal video performance over a
slower network connection, a color setting such as grayscale/Best Compression or Low Color/High Compression
is recommended. See Color depth on page 232.