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Name Game
Premium
join:2002-07-07
Grand Rapids, MI
kudos:7
reply to Sentinel

Re: Tighten up Skype?

Skype when used with UPNP turned on (on both the router and in Skype) will not close open ports on exit. skype uses uPnP to open a port in the router it NEVER closes that port when skype shuts down. This is quite a large security risk and in most cases uPnP is not needed by skype and can/should be disabled. There are a few cases that due to network config skype will need the uPnP as it's only option to communicate to the client but this is the exception and not the rule.
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Dustyn
Premium
join:2003-02-26
Ontario, CAN
kudos:11
said by Name Game:

Skype when used with UPNP turned on (on both the router and in Skype) will not close open ports on exit. skype uses uPnP to open a port in the router it NEVER closes that port when skype shuts down. This is quite a large security risk and in most cases uPnP is not needed by skype and can/should be disabled. There are a few cases that due to network config skype will need the uPnP as it's only option to communicate to the client but this is the exception and not the rule.

Is that because Skype is being terminated without closing out the program correctly? Or is the application not fully UPnP compatible? When an application is exited gracefuly, those ports are then supposed to be closed. But I guess those programs aren't going to wait around forever for your router to respond that ports have been successfully closed.
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Name Game
Premium
join:2002-07-07
Grand Rapids, MI
kudos:7