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Kudos0

Left 4 Dead Portscan.

I recently installed Left 4 Dead and am trying to play it but Norton pops up blocking a Portscan "attack" every 5-10 seconds.

I looked at the log and the Portscan attacker is my own computer. I can't play the game because this keeps freezing it every time Norton blocks my computer from "Portscan"'ing my computer. I have no idea how to stop it other than to turn off Norton while playing L4D. I've added my computer to trusted. I've opened the port it's "attacking". And L4D has full allowance already.

Intruder: MONOLITH(#####).
Risk Level: Medium.
Protocol: UDP.
Attacked IP: 255.255.255.255.
Attacked Port: ######

Replies

Kudos0

Re: Left 4 Dead Portscan.

Would like to help you but without the port number it's hard to do.  The port number would give a clue as to what the scan is looking for and what process / protocol it is using.  PM me with it if you are that worried about it.  Is L4D an online game?

Win10 x64; Proud graduate of GeeksToGo
Kudos0

Re: Left 4 Dead Portscan.

26905 for an hour every 5-10 seconds.

After that it tries 26900 once then goes to 27021 for a bit and then to 26904 for a little while, back to 26905.

Left 4 Dead is a first person shooter. I'm currently playing single player with that problem, but it's connected to Steam all the time.Message Edited by IanDM on 05-01-2009 09:36 PM
Kudos0

Re: Left 4 Dead Portscan.

Well, the ports are just random unassigned (for a specific purpose) ports.  I went to the Steam web site and read up on network troubleshooting and configurations.  I would try the suggestions in these kb at Steam first.  You also my have to do the offline mode of the Steam client (see here).  The issue is that the game / Steam wants to connect to these ports for updates or online info.  A broadcast message over those ports is always going to get flagged by any good firewall.  Not to judge too quickly, but that is not a very well written code to be doing that.  However, offline mode will fix your problem but try the others to help improve the online connections also.

Let us know how this turns out for you.

Message Edited by dbrisendine on 05-02-2009 12:33 AM
Win10 x64; Proud graduate of GeeksToGo
Kudos0

Re: Left 4 Dead Portscan.

Unfortunately, going offline mode I can't use the game. I bought it for playing online and due to the problem I had to play single player since playing a game online that freezes everytime Norton blocks it isn't very good ;).

I tried what they said and opened the ports (that I already had opened) again but it still blocks the Portscan from my own computer. I've just posted in their forums, but a few others have had the problem and they weren't replied to so I don't think I'll get one either. I posted here first due to it being Norton blocking and because the Steam forums require approval of your account to post which takes a few hours  after creating.

Kudos0

Re: Left 4 Dead Portscan.

IanDM, what operating system are you using? Until we come to a better understanding of your issue, you may wish to disable the portscan signature (Internet:Settings->Intrusion Prevention:Intrusion Exclusions:Configure).
Reese AnschultzSenior Software Quality Assurance Manager, Symantec Corporation
Kudos0

Re: Left 4 Dead Portscan.

Asus Crosshair MB
AMD Athlon X2 6400+
eVGA GeForce 8800GTX with 768MB running dual-screen.
2GB Corsair Dominator DDR2 at 4-3-4-10
1.5TB SATA
650w Antec TruePower
Creative X-Fi Gamer
DVD/CD Burner
Antec 180b case with proper cooling
Wired network through D-Link Gamer's edition router(Gigabit) all on "25Mbps" internet connection.

Windows XP completely updated.
Norton 360 2.0
Kudos1 Stats

Re: Left 4 Dead Portscan.

IanDM, thanks for the additional information. Based upon the information that you have provided, I suspect that the only way that you can avoid this problem is to disable the port scan signature altogether.
Reese AnschultzSenior Software Quality Assurance Manager, Symantec Corporation
Kudos0

Re: Left 4 Dead Portscan.

IanDM,

Just out of curiosity, have you considered giving N360 v3 a try? (free upgrade). I ask because I play L4D myself and have not had this particular issue when running v3. Just a thought.

~scott 

Edit: for a bit of clarity 

Message Edited by scott_moen on 05-04-2009 03:52 PM
Kudos0

Re: Left 4 Dead Portscan.

You could also upgrade to N360 v3 for free with your current valid subscription. The best way is to follow the directions at this LINK for the removal of v2 and then follow these directions at this Link to install and setup v3.  The improvements and fixes in v3 may eliminate the Portscan error; if not then post back and I will give directions on how to disable the Portscan signature from the IPS component.
Win10 x64; Proud graduate of GeeksToGo
Kudos0

Re: Left 4 Dead Portscan.

I already deselected the Portscan option when I couldn't figure out any other way. I just wanted to find another way ;).

Am I selecting Premier or regular 360 with that upgrade? I didn't realize I was able to get a free upgrade.

I own the 360 v2.0 for three computers. Nevermind -- through process of elimination I figured out the answer ;). I'll edit this to say whether the problem went away or not when I'm done installing.

Message Edited by IanDM on 05-04-2009 04:07 PMMessage Edited by IanDM on 05-04-2009 04:58 PMMessage Edited by IanDM on 05-04-2009 04:59 PM
Kudos0

Re: Left 4 Dead Portscan.

Can't seem to edit the last post again so the problem has gone away it seems. v3 doesn't pop up incessantly about L4D and I was enjoying the game. I left portscan selected and it didn't have a problem with the game.

Not sure where to check on this new version though for the log to see if it's still doing it. But thank you all for the help.

Kudos0

Re: Left 4 Dead Portscan.

If you have not modified the IPS 'definitions' or the notification alerts in the settings, then the Firewall in v3 is not detecting this as a problem (the firewall IS working the way it should).  There actually may have been a glitch in the v2 firewall as I have never seen any firewall warn about itself doing a portscan before. Never.  Anyway, I apologize for this taking so long as I should have asked what version N360 you were running; with Norton's upgrade policy for valid license holders of 'it's free' I just assume everyone goes for the improved software.  Sorry for doing that to you.  Glad it worked out OK.
Win10 x64; Proud graduate of GeeksToGo
Kudos0

Re: Left 4 Dead Portscan.

No problem; I was unaware of free upgrades. I usually just bought the newest version when my subscription ran out.
Kudos0

Re: Left 4 Dead Portscan.

Nothing wrong with that.  Just so you know for the future, you may want to check this forum from time to time as version announcements are regularly featured here. Message Edited by dbrisendine on 05-05-2009 07:01 PM
Win10 x64; Proud graduate of GeeksToGo

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