"ERROR: Open failed for file ABC. ERROR: Host name sroc not found."

[ankitsri]

options set=SAS_FTP_AUTHTLS="1";
options set=SSL_USE_SNI=0;
options set=SSLREQCERT=ALLOW;

filename ABC ftp "&fname" host='sroc' PASSIVE user=&mfusr pass=&mfpass debug
                     rcmd='site unit=sysda recfm=fb lrecl=90' recfm=fb lrecl=90;
   run;

Hello SAS Community Members, Can anyone please help me with below error 

ERROR: Open failed for file ABC
ERROR: Host name sroc not found.

[Kurt_Bremser]

Your DNS could not resolve the hostname. Check under which name the server is accessible from your SAS machine; it might be that you need to use the fully qualified domain name, or that access is blocked by firewalls.