You may also want your host to set up a non-standard port for connection (a high number port) and try that.
Some ISPs have been known to block FTP and SSH connections on standard ports at times, especially if they see a spike in bandwidth or other issues. They may block the ports, etc.
Also, if your ISP uses asymetrical routing (the return route is not the same as the route to your box) you may have a bad hop on the return that is blocking FTP and ssh traffic, but port 80 traffic is being handled differently. That is quite a bit harder to trace down.
You may want to ask your host to give you temp access to FTP to another box they have their, to see if in fact you can connect to any boxes inside that IP block... you may find it is nothing to do with your PC or host, but rather in the ether of the internet.
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