To automatically configure Citrix Receiver or Online Plug-in with the Web Server Address on client computers you can utilise Group Policy Preferences to create the necessary registry key.
Create a new or modify an existing GPO and browse to Computer Configuration > Preferences > Windows Settings > Registry
Create “New” > “Registry Item”
Action – Replace Hive – “HKEY_LOCAL_MACHINE” Key Path – SOFTWARE\Citrix\PNAgent (32-bit client computers) OR Key Path – SOFTWARE\Wow6432Node\Citrix\PNAgent (64-bit client computers) Value Name – ServerURL Value Type – REG_SZ Value Data – http://SERVERNAME/Citrix/PNagent/config.xml
Click OK to finish
Once the Group Policies have been refreshed on the client computers, the registry entries should have been enforced.
Running the Citrix Online Plug-in should reveal the setting changes have been applied.