How to see a list of Blocked Ports

[VictorianReaper]

So i'm at a Hotel and i realized i needed to access my FTP server back home but im having trouble accessing it  because its being blocked i would like to know if there is a way, as a (non-Ethernet) client to see what ports are not blocked so i can access my files  

[Oshino Shinobu]

Without getting into the router's configuration, I don't know of a way. 

 

There may be some tools that test each port to see which are closed and which are open, but I really wouldn't advise using something like that on a network that isn't your own. The legality of it is somewhat questionable, as it could potentially be used for hacking purposes. 

[Oshino Shinobu]

So many double posts -.-

[Theguywhobea]

Yeah, if you have a linux distro, nmap can be used to check with ports are open on a network. Although like it was said earlier, it's questionable as to whether or not it's legal, and even if it is legal, the sysadmin at the hotel (or whoever they contracted) probably won't be too happy.

[brwainer]

Pick a random port >1024.  Look that port up on http://www.speedguide.net/ports.php and make sure it isn't well-known for particular malware. That port is unlikely to be blocked. Or use a port traditionally used for other purposes, like 80 or 443, that the hotel could not possibly block.

[Eniqmatic]

Use the internet for an FTP test site (they do exist, used them for this before). Try connecting to aforementioned test site over FTP. If connection fails, most likely blocked, if not you may have an issue on the server.

 

Free and legal.