how to clear sorry cannot create a connection to the selected as/400 server
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For a Zero cost solution do the following: Install Java runtime environment. Register at IBM and download IBM i ACS (Access Client Solutions). Take ZIP file and unzip this to a local folder and install this on your machine. Hint: If installing on a Linux or MAC then unzip on these machines - do not use the unzipped folders/files from a Windows machine you will loose the file attributes. Install time will be about 1 minute. Configure software and point yourself to PUB1.RZKH.DE and that will allow you to connect to the system. If you are geek enough you can even run IBM i ACS on a Raspberry PI computer.
You can install just the 5250 emulator or the full software suite.
Again the cost is Zero dollars. You will spend more time installing Java runtime environment than installing the IBM i ACS.