@roy, why not a "GET" request?
(LM:GETURLTEXT "http://time.nist.gov:13") => ERROR
(LM:GETURLTEXT "ftp://topex.ucsd.edu/pub/srtm15_plus/README.V1.txt") => ERROR
(LM:GETURLTEXT "https://www.theswamp.org/") => OK
(KGA_Data_InternetServerTextGet "http://time.nist.gov:13") => OK
(KGA_Data_InternetServerTextGet "ftp://topex.ucsd.edu/pub/srtm15_plus/README.V1.txt") => OK
(KGA_Data_InternetServerTextGet "https://www.theswamp.org/") => OK