Moreover, SSH has stopped working, too. But, finally I found a way to circumvent it. A simple twist in the client side, could simply bypass the filtering.

I wrote a simple script to do this, and I would like to share it with all of my countrymen:

https://launchpad.net/~mohammad-sepent/+archive/ppa/+package...

To use it, just replace ssh command with issh like this:

issh user@hostname [other-ssh-options]