curl (7) couldn't connect to host
I'm trying to import some data from UniprotDatabase with this command:
curl 'ftp://ftp.uniprot.org/pub/databases/uniprot/current_release/knowledgebase/complete/uniprot_sprot.xml.gz' -o uniprot_sprot.xml.gz
But when I execute it, an 'curl (7) couldn't connect to host' error occur. Can someone help me to deal with this?
Thanks and regards,