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I'm currently using a Windows box, running Chrome 27 on the dev channel, and I have what I believe to be an unusually large number of listening connections connected with the process.

The following command returns 268 listening ports:
netstat -aon|find /i /c "11692"
(where in this case 11692 is the main chrome process)

This is what some of the ports looks like from netstat:

UDP    0.0.0.0:62483          :                                    11692
UDP    0.0.0.0:62486          :                                    11692
UDP    0.0.0.0:62487          :                                    11692
UDP    0.0.0.0:62488          :                                    11692
UDP    0.0.0.0:62489          :                                    11692
UDP    0.0.0.0:62492          :                                    11692
UDP    0.0.0.0:62493          :                                    11692
UDP    0.0.0.0:62494          :                                    11692
UDP    0.0.0.0:62495          :                                    11692
UDP    0.0.0.0:62496          :                                    11692
UDP    0.0.0.0:62498          :                                    11692
UDP    0.0.0.0:62499          :                                    11692
UDP    0.0.0.0:62500          :                                    11692
UDP    0.0.0.0:62501          :                                    11692
UDP    0.0.0.0:62502          :                                    11692
UDP    0.0.0.0:62503          :                                    11692
UDP    0.0.0.0:62504          :                                    11692
UDP    0.0.0.0:62505          :                                    11692
UDP    0.0.0.0:62506          :                                    11692
UDP    0.0.0.0:62509          :                                    11692
UDP    0.0.0.0:62510          :                                    11692
UDP    0.0.0.0:62511          :                                    11692
UDP    0.0.0.0:62512          :                                    11692
UDP    0.0.0.0:62513          :                                    11692
UDP    0.0.0.0:62541          :                                    11692
UDP    0.0.0.0:62542          :                                    11692
UDP    0.0.0.0:62543          :                                    11692
UDP    0.0.0.0:62544          :                                    11692
UDP    0.0.0.0:62545          :                                    11692
UDP    0.0.0.0:62547          :                                    11692
UDP    0.0.0.0:62786          :                                    11692
UDP    0.0.0.0:62787          :                                    11692
UDP    0.0.0.0:62789          :                                    11692
UDP    0.0.0.0:62790          :                                    11692
UDP    0.0.0.0:62791          :                                    11692
UDP    0.0.0.0:62792          :                                    11692
UDP    0.0.0.0:62793          :                                    11692
UDP    0.0.0.0:62794          :                                    11692
UDP    0.0.0.0:62796          :                                    11692
UDP    0.0.0.0:62797          :                                    11692
UDP    0.0.0.0:62798          :                                    11692
UDP    0.0.0.0:62799          :                                    11692
UDP    0.0.0.0:62800          :                                    11692
UDP    0.0.0.0:62801          :                                    11692
UDP    0.0.0.0:62802          :                                    11692
UDP    0.0.0.0:62803          :                                    11692
UDP    0.0.0.0:62805          :                                    11692
UDP    0.0.0.0:62806          :                                    11692
UDP    0.0.0.0:62807          :                                    11692
UDP    0.0.0.0:62808          :                                    11692
UDP    0.0.0.0:62809          :                                    11692
UDP    0.0.0.0:62810          :                                    11692
UDP    0.0.0.0:62812          :                                    11692
UDP    0.0.0.0:62813          :                                    11692
UDP    0.0.0.0:62814          :                                    11692
UDP    0.0.0.0:62815          :                                    11692
UDP    0.0.0.0:62817          :                                    11692
UDP    0.0.0.0:62818          :                                    11692
UDP    0.0.0.0:62820          :                                    11692
UDP    0.0.0.0:62821          :                                    11692
UDP    0.0.0.0:62822          :                                    11692
UDP    0.0.0.0:62823          :                                    11692
UDP    0.0.0.0:62824          :                                    11692
UDP    0.0.0.0:62825          :                                    11692
UDP    0.0.0.0:62826          :                                    11692
UDP    0.0.0.0:62827          :                                    11692
UDP    0.0.0.0:62828          :                                    11692
UDP    0.0.0.0:62829          :                                    11692
UDP    0.0.0.0:62830          :                                    11692
UDP    0.0.0.0:64681          :                                    11692
UDP    0.0.0.0:64682          :                                    11692
UDP    0.0.0.0:64683          :                                    11692
UDP    0.0.0.0:65017          :                                    11692

Maybe I'm missing something with my reading of netstat, but this seems unusually high.

This is a repeat issue. The only thing needed to evoke the massive number of ports listening is to start Chrome. Also, when I close Chrome, always at least one process is still running after I close the browser, and seems to run indefinitely (this is not the process associated with the large number of ports open - or at least not by itself - as the ports go away when I close the browser).

Does anyone know:

  1. If this is normal?
  2. If it's not normal, what could explain it?
  3. How I could find out more information about what is actually going on?

I have Wireshark installed, but it always seems to confound my understanding, and I haven't felt like trying to grok it yet. Also, Windows Event Log reveals nothing.

Note that this is not a duplicate of question Why does Google need so many ports open? as these ports are not dedicated to - and do not appear to be related to - any websites at all.

Thanks in advance.

share|improve this question
2  
You've messed with your experimental settings... that's why! Check chrome://flags/ and tell me if "Built-in Asynchronous DNS" is Enabled or Default/Disabled... it should be Default. –  user208242 Mar 18 '13 at 10:47
    
Nice! I think you are absolutely right. I had messed with some flags, though I can't remember whether that was one of them. However, after a regular chrome version update, this stopped happening. Maybe that flag reverts after update - it is on default now. Other flags I've set didn't revert. Anyway - thanks for helping remove the mysterious nature of the issue:) –  user1167442 Mar 20 '13 at 4:26
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1 Answer

up vote 1 down vote accepted

Enter this in the address bar of Google Chrome:

chrome://flags/

Scroll down the list and make sure "Built-in Asynchronous DNS" is Disabled.

share|improve this answer
    
Welcome to Super User! Please add some more details for somebody not in the know. You should modify your original question to add additional information. –  vonbrand Mar 31 '13 at 23:13
    
@vonbrand: I don't think he's the question asker. By "I should have posted this as an answer" looks like he was referring to his previous comment above, which seems to have solved the issue. What I don't understand is, why didn't he use the same username and password he had already registered with, instead of creating a new user with the same name? –  Karan Apr 1 '13 at 23:06
    
@Karan, the email got somewhat malformed when I registered, and I could not access that account anymore. I've experimented with some password lockers and one made me some issues, it's not the only case when I typed my email and it got rewritten... thus I made a new account. –  emm980 Apr 3 '13 at 1:23
2  
Build-in asynchronous DNS is enabled per default ever since Chrome 26. Since I use a custom firewall, I was able to see all these port connections pop up after the Chrome update. However, I have not found any documentation as to why in the world asynchronous DNS wants to open up several dozen new ports. Do you have a clue? –  king_julien Apr 8 '13 at 9:02
    
Thanks...I just got that you were the same person who posted the comment and have accepted your answer. –  user1167442 Apr 10 '13 at 1:03
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