PHP guru (socket vs firewalls question)
 

I have 2 scripts.

The first one will be on my server and will be listening for incomming socket connections.

The second one, will be a client distributed on multiple server (which I don't know the servers config.).

My question is will the firewalls on my clients server block the connection attemp with php fsockopen() ?

Thanks.

no.
that doesn't depend on that.
fsockopen is no different than a regular socket.

Depends on the firewall config. What port is your script listening on?

12345 right now ... but aren't all unused ports blocked by default ? Dedicated servers will be able to open this port ... but I guess webmasters on virtual servers will find it more difficult to open this port...

It should work fine for most of the clients as many aren't doing egress filtering, or any filtering for that matter, but others with proper rulesets will have to allow the traffic out.

I though a high percentage of servers would be properly proteced by firewalls.

if your controlling whats listening on that socket, do what you please ;-) Add auth codes and code in your ips or domain lists for auth. Your own type of firewall, just on socket level. :P

The server end isn't the problem ... I'm wondering if firewall will block outgoing infos when the client connects.