Hi MG18,
it seems that client machine is unable to validate the apptest (domain name) with the IP address of the SAS server.
make sure you have configured the DNS to resolve the domain name to IP address and vice-versa OR place the hosts entries to redirect the request directly.
In windows:- open hosts file with editor with administrative rights.
Host Entries path : C:\Windows\System32\drivers\etc\hosts
127.0.0.1 localhost
xxx.xxx.xxx.xx apptest.
save and exit.
then try to connect the same once again.
** if you have multiple tier SAS server then place all 3 (Meta, Compute, Mid-tier) host entries to resolve the issue.
make sure all SAS services/server must be validated through SAS management console.