I have macos high sierra 10.13.6. I have been using redhot remote and pulse secure to connect to vpn. I have been connected but facing issue while tryin to launch ica file " Terminal service is not supported on this computer". Please advise on this.
This is a Citrix terminal server error message. This means your Citrix client installed is either not the correct version, not fully installed or otherwise not compatible with MacOS X High Sierra.
Your best bet is to contact the Citrix team for the server you are trying to connect to. They should be able to get you a compatible version link to download a dmg from Citrix for their setup.