The function gethostbyname returned error 1 for host "-". Locale=C

Locale=C OpenLink Interactive SQL (Virtuoso), version 0.9849b. Usage : isql <HOST>[:<PORT>] <UID> <PWD> file1 file2 ... isql -H <server_IP> [-S <server_port>] [-U <UID>] [-P <PWD>] [-E] [-X <pkcs12_file>] [-K] [-C <num>] [-b <num>] [-u <name>=<val>]* [-i <param1> <param2>] isql -? Connection options: -? - This help message -U username - Specifies the login user ID -P password - Specifies the login password -H server_addr - Specifies the Server address (IP) -S server port - Specifies the TCP port to connect to -E - Specifies that encryption will be used -C - Specifies that password will be sent in cleartext -X pkcs12_file - Specifies that encryption & X509 certificates will be used -T server_cert - Specifies that CA certificate file to be used -b size - Specifies that large command buffer to be used (in KBytes) -K - Shuts down the virtuoso on connecting to it Parameter passing options: -u name1=val1... - Everything after -u is stored to associative array U, until -i is encountered. If no equal sign then value is NULL -i - Ignore everything after the -i option, after which comes arbitrary input parameter(s) for isql procedure, which can be referenced with $ARGV[$I] by the ISQL-commands. <OPT>=<value> - Sets the ISQL options Note that if none of the above matches then the non-options go as <HOST>[:<PORT>] <UID> <PWD> file1 file2 ...