(HKEY_CURRENT_USER=>Software=>Intergraph=>Intools) is unique per each Intools user. It's recommended for now, changing this value manually to "0" for all users and check if this number changed automatically when each user enters into application and logout and login again. Otherwise, make the ConnectionID as unique manually per each user.

If the ConnectionID not changed to unique number probably it’s a problem with access right write to the registry and you need to fix it first.

It is another option to manage the ConnectionID in the Intools.ini on the terminal server \citrix  user profile folder

Please perform the following on all users intools.ini [Environment] section:

ConnIDINI=1

ConnectionID=0

check if this number changed automatically when each user enters into application and logout and login again.