A Service Worker registered in 2021 could still be attempting to fetch resources from https://localhost:11501/2021 . You can check this in DevTools > Application > Service Workers.
When a user attempts to launch a virtual application, the Citrix Workspace app on the local machine acts as a proxy. It spins up a local listener on port 11501 . The application attempts to connect to https://localhost:11501 to negotiate the secure tunnel for the ICA data stream. https localhost11501 2021
To properly debug or configure this address, it helps to break down exactly what each element means: A Service Worker registered in 2021 could still
Port 11501 isn’t standard, so it likely belongs to a specific tool. In 2021, some popular possibilities: some popular possibilities: