Why: 121E Missing or Invalid Connection Parameters – CyberArk PSM

When you attempt a connection through CyberArk, you receive a connection error message.

Failed to establish connection.

Reason: 121E Missing or invalid connection parameters.

Use the following syntax to provide the connection paramters in the Start Program setting:

psm/u <taget-user[@domain-address]> /a <target-address> /c <connection-component>

Verify your start program command connection string.

For a Domain Account:

alternate shell:s:psm /u This email address is being protected from spambots. You need JavaScript enabled to view it. /a targetServerName.com /c PSM-RDP

For a Administrator Account:

alternate shell:s:psm /u Administrator /a server.com /c  PSM-RDP