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A client can not connect to the VPS because the server blocks it.

He has to change several times his IP to conect. This is a serious problem. I have a rule in the firewall where I allow his conection always to the server but it is not working. why?

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closed as not a real question by joeqwerty, MDMarra, Grant, Ward, voretaq7 Jun 7 '13 at 3:23

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

You need to do a LOT more troubleshooting for this question to be answerable. See this Meta topic for some tips – voretaq7 Jun 7 '13 at 3:23

It's practically guaranteed that your "client" has a dynamic IP assigned by DHCP, meaning that he gets a new external IP every so often.

You won't be able to filter by IP alone, as you've already seen. Try going up one netblock and see if that's a big enough net to allow his ISP's netblock. For example, if you're allowing, try allowing everything in 198.51.100.X. If not, work on a better authentication mechanism using SSL certificates or similar.

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The "client" has fixed IP, is because he has to change the IP to conect is really a problem. – Victor Navarro Jun 7 '13 at 5:57

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