A lot of users reported me this error when they try to post:
"The host you are trying to send the input from is not a valid host."
We undersand that this is caused by firewall software, disabling it everything works fine, but... some users (and me) wants to know why of this and wich port are affected.
This is related to their own security and I would like to give them a clear and right explanation.
Can you help me?
Thank you !
