When I try to scan a network using this command:
nmap -Pn -f -A ( specific ip adress)
First off - is there a reason why you are using
I cannot find out which ports are open but I get this result:
All 1000 scanned ports on 10.10.10.3 are filtered
This response implies nmap isn’t seeing anything back from the server. There are lots of reasons for this - for example it could be because the fragmentation you are using is causing the packets to be dropped.
On HTB I would normally say it means that either the server isn’t up, or you aren’t connected to the right network but I dont think that is the case here.
Too many fingerprints match this host to give specific OS details
When I use nmap -Pn -f -a (name of box) (specific ip adress)
I am not sure what you mean here, I dont see how putting the name of the box should work but I dont recognise the -a (lowercase a that is) switch.
As a test, can you try
nmap -Pn -A -p- --reason -vvvvvv 10.10.10.3 and let me know what response you get, please?