When connecting to the B450 while using TeraTerm, "Menu access disabled." may display if the B450 had previously been connected to the SDI2 bus on a GV4 or B-Series panel.
Bosch Security Knowledge Base
If the setting: SDI2 Modules (Module 1 or Module 2) > IP Communicator > Web/USB Access Enable is set to No, access to web browser or TeraTerm menu programming will become disabled.
When the B450 is connected to SDI2 and addressed concurrently with the Web/USB Access Enable=NOsetting (Mod 1 or Mod 2), and programing is sent to the panel, "Menu access disabled. may display.
There are 2 ways re-enable access to menu items in TeraTerm
Verify the B450 is set to the same address used in the program entry for Module 1 or Module 2 Send the changes to the panel. Menu access in TeraTerm will be available using the password configured in RPS