Apple Macs keep loosing connection to server

Hi there, we have a client with a small network Server 2008 backend mix of PC and Mac. The Macs keep getting booted off the server and disconnecting remote desktop connection in under 3 minutes. They will auto reconnect but not straight away. Any ideas?
grovenetsupportAsked:
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Rob GMicrosoft Systems EngineerCommented:
You don't have power save turned on, on the NIC on either the server, or the MAC do you?

Also,
I am really not a MAC guy, But i assume MAC doesn't know about group policy.. Windows does not stay connected to the DC constantly either, but does it based on poles, if the policy is default; 2-5min for first connection and every 15min after that.. and only to update user rights etc..
Maybe with MAC you see that connection state change.?
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grovenetsupportAuthor Commented:
Hiya, the mac just connects via smb and you can be typing away on something and the connection drops
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Rob GMicrosoft Systems EngineerCommented:
Wired connection or wireless?
Laptop or desktop?
MAC with Intel inside.. or old MAC?

This sounds like more of a network related issue, and not a connection to Windows issue. Do you lose all connection to the network, or only lose connection to the RDP session?
are you internal when you are RDP'ing to the system, or are you connecting via VPN and RDP'ing to the server through the VPN?
Is it all systems? or just a few here and there?
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Justin Pierce, CEH, CNDANASA Cybersecurity EngineerCommented:
Hi Grovenetsupport,

 I've seen this problem quite a few times and it is usually related to DNS. Here is a great document to start with: http://training.apple.com/pdf/wp_integrating_active_directory_mav.pdf

Page 5 is where you should start from.

That said, I would recommend Thursby's ADmitMac: http://www.thursby.com/products/admitmac
It really turns the Mac into a true AD client and is great for bringing your Mac into secure AD environments. (It was the only thing that allowed me to work in big corporations that see Macs as alien technology. lol)

Hope this helps.
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grovenetsupportAuthor Commented:
Thanks will give it a go and come back to you
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grovenetsupportAuthor Commented:
Only confusion is it only started this week after 2 years of being fine?
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grovenetsupportAuthor Commented:
Ok been on site today and the actual problem reared its head. When 2 mac users enter the same smb share the one gets booted off. I changed one of the machines to link using cifs:\server and both seem to go on together?
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Justin Pierce, CEH, CNDANASA Cybersecurity EngineerCommented:
Great news! A little weird, but still good news. Could be something going on with OpLocks or Breaks. This is the what I could find out about the Level2 OpLocks, "If an exclusive OpLock is held by a client and a locked file is opened by a third party, the client has to relinquish its exclusive OpLock to allow the other client's write/read access. A client may then receive a 'Level 2 OpLock' from the server. A Level 2 OpLock allows the caching of read requests, but excludes write caching."

Not sure, but it's a educated guess and a place to start from. If you ever get the chance try out the Thursby software, it truly was a lifesaver for me when I needed to make my Mac act and behave like a MS system.

VR,

MacGuy47
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grovenetsupportAuthor Commented:
Not good didn't last long and problem has come back. I think there must be a DNS issue on the network or something as this is bizarre. Been working fine for 2 years then Monday bang! There were two windows updates on the 10th and 11th both to do with remote desktop updates but I have removed them and rebooted server
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Justin Pierce, CEH, CNDANASA Cybersecurity EngineerCommented:
Alright, bad news then. Did the rebooting of the server help? If not then certainly check the DNS. You may want to perform a packet trace and see if can make heads or tails as to what is going on. Pg 6-7 on the PDF should assist you in getting this done. Wireshark of course is better, but as most Sys Admins & Net Admins will tell you "Use whatever you got to get the job done."
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grovenetsupportAuthor Commented:
Just to mention LogMeIn sessions don't last either can be on for 60 seconds or 3 minutes and bang booted off?
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grovenetsupportAuthor Commented:
You wouldn't believe it. I have been running network scanning software for IP addresses on the network. Just a chance I change the IP of the server and scanned again, guess what the server IP was still being used by a Sky Wireless device someone put in the weekend before last!!!!!


Simple but what a waste of time. The only reason this showed was on a forum someone said to set the NIC to 100mps/full. Didn't do anything so switched back to auto and server popped up with an IP conflict!

Your help has been welcomed as always and he is now walking funny but he has in built wifi!
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Justin Pierce, CEH, CNDANASA Cybersecurity EngineerCommented:
Hi Grovenetsupport,

Awesome news! It's always the small things that get us. When I taught the Sys Admin course for a large corporation I always hammered into the students that 99% of the problems are going to be at the physical layer, lol. Even though this wasn't at layer 1 it still goes to show we should've looked for the small bits first. Well, I'm glad that everything turned out alright and that he now has built in Wi-Fi, LOL, (funny image running around my head) =P . Take care and see you around.

VR,

MacGuy47
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grovenetsupportAuthor Commented:
Thanks for all your help guys
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grovenetsupportAuthor Commented:
Problem solved itself
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Windows Server 2008

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