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SonicOS 5.8.1 Administrator Guide
Multiple TSA Support
To accommodate large installations with thousands of users, SonicWALL network security
appliances are configurable for operation with multiple terminal services agents (one per
terminal server). The number of agents supported depends on the model, as shown in Table 3.
Table 3 Multiple TSA Support per Model
For all SonicWALL network security appliance models, a maximum of 32 IP addresses is
supported per terminal server.
Encryption of TSA Messages and Use of Session IDs
SonicWALL TSA uses a shared key for encryption of messages between the TSA and the
SonicWALL appliance when the user name and domain are contained in the message. The first
open notification for a user is always encrypted, because the TSA includes the user name and
domain.
Note The shared key is created in the TSA, and the key entered in the SonicWALL appliance
during SSO configuration must match the TSA key exactly.
The messages between the appliance and the TS agent (and the SSO agent too) are DES
encrypted (using triple-DES) and DES uses a numeric key that can be represented by a
hexadecimal string. Each octet of the key requires two hex digits to represent its value, hence
the key needs to be a even number of hex digits.
Using a hexadecimal key contributes to the encryption strength. For example, if a pass-phrase
was used instead and converted to a numeric key, the end-result would be no different than
using the numeric-key directly and the pass-phrase would be more guessable than the hex
representation of the key.
And also note that the information that we are “protecting” here is actually not very sensitive. It
is simply a mapping between user names and TCP/UDP connections (TSA) or user names and
IP addresses (SSO). No sensitive data like passwords is transferred.
The TSA includes a user session ID in all notifications rather than including the user name and
domain every time. This is efficient, secure, and allows the TSA to re-synchronize with Terminal
Services users after the agent restarts.
SonicWALL Appliance Model TS Agents Supported
NSA E7500/E8500 256
NSA E6500 128
NSA E5500 64
NSA 5000 32
NSA 4500 16
NSA 3500 16
NSA 2400 8
NSA 240 4
TZ 210 Series 4
TZ 200 Series Not supported
TZ 100 Series Not supported