Nmap scanning problem( possible filtration)

[Lord Doskias <lorddoskias () abv bg>]

First hello to everyone.

I've been using nmap for some time now and it did a great job , unitl one day (3-4 months ago) the scan just said 
"there are no open ports on the machine". Since then, I'm not able to use nmap on  internet machines (only in my 
intranet).I think that my ISP is doing some kind of filtration of packets , my first guess was that ICMP packets are 
filtered , but that's not true because I get ping to the machines I want to scan.Even scanme.nmap.org is giving no open 
ports.I tried most of the scanning methods (sM, sS, sT, sA) none of them worked.I'd be glad to hear your suggestions.

Thanks in advance.

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