Nmap uses slightly different terminology for the results of it's scans, filtered simply means nmap found a port that's 'filtered' by a firewall and is unable to detect if it's open or closed. Didn't you run these scans once before with PCFlank/GRC?
Try running a host scan using -v -f -sV -PN as the nmap switches. You might get an error but you can ignore that.
excuse the ignorance but what it means nmap-sV-v-f-Pn?Now all ports are filtered.thanks!
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