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OS X - Operating System General OS operation information and support

Could This Be A Virus or Spyware


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MacPow

 
Member Since: Feb 04, 2010
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Hi. I hope this is the right forum....

I have an fairly new iMac purchased in November 09, running OS-X. It is connected to my broadband modem by cable. There is a linksys wireless router also on the modem. I also use a MBP '08 model running OS-X.

Until a couple of weeks ago, everything worked flawlessly. Internet/Wireless Router/iMac/MBP... Lately, when the iMac is running and is logged into a user, with no programs running, no safari, iTunes, mail, whatever...the modem shows activity... even when the MBP is not on. When safari is launched on the iMac the internet is very slow, if I'm able to surf at all. The MBP has a good airport connection with linksys, but the server and internet are not functioning and I can't surf with the MBP at all... Unless, I go to the iMac and log out of whatever user is logged in... then all is well with the internet with the MBP.

As I mentioned at the beginning, this is a new problem.

I fired up the activity monitor on the iMac while logged in... No unusual looking programs are listed, the network shows periodic data being sent and received, even though no programs are running.

I was pretty good at cleaning out windows systems, but I got sick of it and went ALL MAC... but now I feel pretty clueless. It is entirely possible that my kids have been to sites that share files, but I don't know where to start looking...

Oh, one more thing... we live in the country... There are no other homes or networks within range.

Any suggestions? Thoughts? Links?

Thanx!!
Mark
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kumpooterjooser

 
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Scan the machine for virus. If you don't have any anti-virus software then try ClamXav
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McYukon

 
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Download the LittleSnitch demo and see what exactly is using your internet.
Since I am on a satellite connection I use it a lot to see if any application is connecting out all the time and possibly robbing me of my limited bandwidth.
When LittleSnitch is running you can control what applications are allowed to connect out and you can see where they are connecting to.

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SoaringDodo

 
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I think the issue is that you are connecting to both the modem and the router simultaneously if I understand your post correctly.

Is the Linksys a router or a wireless access point?

If the modem and router are both trying to dole out IP's and do NAT, then there is too much potential for conflict.

I would suggest that you connect the iMac cable to the router so that it is the only device handling both the iMac and MacBook. You will then only have one device handling NAT and DHCP.
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MacPow

 
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Thanx, will try all three suggestions and get back to you with progress and updates.
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MacPow

 
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OK ... I installed little snitch

WTF is mDNSResponder? Lots of activity there with no programs running.
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6string

 
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You probably didn't want a big read.... but this will explain it
Bonjour - Frequently Asked Questions and before you think of disabling it, read Mac OS X v10.6: Disabling mDNSResponder will disable DNS
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MacPow

 
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thanx!

Hmmmm.... I think that the problem I mentioned in the OP, may have started after I installed the software for an Epson Artisan Printer... Although I hardwired it by USB.... I wonder, the link you gave mentioned that bonjour will be used for communication with some printers.

BTW, this sucks. I mean, things were going along just peachy.

Do you think tracking down the address it's trying to connect (???) to would help...

Mark
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6string

 
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I would actually just quit the process in activity monitor, and reboot.
Could be as simple as that.
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harryb2448

 
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And do not bother with AV software as there are no viri for Mac OS X. All it will do is slow your machine down searching for things that do not exist using definitions for Windows viri.
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6string

 
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Quote:
And do not bother with AV software as there are viri for Mac OS X. All it will do is slow your machine down searching for things that do not exist using definitions for Windows viri.
In case that confused you a little, I'm certain that Harry meant to say "no viri" for OS X
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MacPow

 
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Yea, no viri, I get it.... which is why I went all Mac... I've had no regrets until now, unfortunately.

So, actually I was wrong about the router setup... It is a linksys wireless router which is connected to the broadband modem... both the iMac and the MBP are wireless... At one time we had the iMac connected by cable to the router.... Which I tried, no difference.

Why does the MBP have no problems, but the iMac does, and why does the MBP have problems only when the iMac is logged on???

The mDNSResponder gave an IP address... which I looked up and, I think it is the address for the SpeedStream modem!!!

hmm...

If it was the modem, then the MBP wouldn't connect....

Well, I guess a call to apple is in the future. Man this mDNSResponder is some evil %$#^ when things go wrong!

Thanx
Mark
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6string

 
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What version of OS X are you running on with the iMac?
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DarkestRitual

 
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Have you tried unplugging and resetting your router to factory settings? Or getting a new one that preferably isn't a linksys/cisco pile of crap? (The old linksys routers were pretty decent, til cisco bought them... now their home routers are crap - too early to tell on the Valet router though). If you do, I'd go netgear.

As for little snitch, yea it's good to know what's going on, but you're also being paranoid about something that is a natural system action (mdnsresponder). :-P
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MacPow

 
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Thanx all...

I think I may have figured it out.

Is it possible that if a piece of software is trying to connect to update itself, ie, arcsoft, Epson printer software and cannot connect to the site, would it keep trying? And this is the mDNSResponder problem.

I disallowed it in little snitch, but I don't know....

Which brings me to the next question. I would have known how to do this in windows, but not mac...

I wanted to get rid of this connect service, which is what I think the problem is, but it's in use, trying to freakin' connect and OS X won't let me delete it...

Is there a comparable start up folder in OS X like there is in Windows? So I can delete it there and reboot?

Mark
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