I'm not able to scan external IP subnet from qualys external scanner. As prompt an error host not alive.But, when i check through nmap it shown hosts are up....
You will need to whitelisted our range of Scanner IP's. See Help--About on the Qualys UI. Look for SoC IP's.
If nMAP has worked, do you see what port was it detected on and add them to Qualys discovery ports if not already.
Ports are same on the all the IP... and also all the ports are a part of option profile we created..but still shows an error " host not alive " from qualys..
I recommend contacting Support, and they can work with you to diagnose what is happening in your account.
when you do an NMAP, you perform this from a different source that our external scans will originate from, so in fact, that isn't telling you much, as it only tells you that from the test system the machines show as alive.
what you need to confirm is, as per DebJ's remark, is your external firewall allowing the source IP address ranges from the Qualys datacenter your subscription is active in? please verify on your firewall / firewalls if the traffic is allowed or not.
It would be great if you could share the reason for the same if the issue was fixed.
Retrieving data ...