PCs Losing Mapped Drive Connectivity

Just as the title states.
I run a windows 7 professional network with a SBS 2011 standard server. Randomly during the day, everyone in the office loses connectivity to the mapped network drives for like a minute then it comes back. no red X or anything like that and i can still be logged into the server via RDP. also i cant access mapped drives on the server either. the the event logs are pretty clean on the server except for an ASP.NET 2.0 Event ID 1309, PCs are set with static IP addresses, AntiVirus has been turned off and it still happens. I am banging my head against the wall with this. Any help would be appreciated.  Below is a link to my TechNet Post with more information. No one has responded in a few days though.

https://social.technet.microsoft.com/Forums/windows/en-US/2ad86131-439b-47af-a3b9-c8cdf9991ab0/pcs-loosing-mapped-drive-connectivity?forum=w7itpronetworking
Marc HutchinsonAsked:
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Wayne88Commented:
When you lose the drive map, do you also lose connection to the server?  You can use tool such as ColaSoft Ping Tool to troubleshoot connection issues.

When you said you still can RDP, did the RDP session freezes when during this time or active?

It may be the server NICs card going bad or overloarded or maybe it just need a driver update.  Do you have extra NICs on the server?  Can you team it?
Scott GorcesterCTOCommented:
What comes to mind is a networking issue. This could be a problem with your network hardware or with the networking stack on your server. First question is do you have a single nic and a single IP address or are there other connections to the server? Also curious if there is a loop in the switching somewhere, (a loop can be created by plugging an ethernet cable into a switch port and the plugging the other end into another port, loops can cause all kinds of havoc and be hard to trace. also curious to know if there are some bad DNS entries. If your network shares suddenly start working when you end an RDP session I would be very suspect of the network card in the server and whether its healthy or needs a newer driver. I have seen a few horrible situations that cleared up after using a different card.

Scott Gorcester MCITP
Marc HutchinsonAuthor Commented:
I can ping the server no problem. I can still be active in the RDP session no problem. Its not a hardware issue at all. I have updated all network drivers (all hardware drivers on the server actually). Check the TechNet Link i supplied for more information. Its really weird. it seems to be tied to user logons.
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Marc HutchinsonAuthor Commented:
Forgot to mention, i have a single NIC connected. no teaming or sharing.
Wayne88Commented:
It could be the NIC issue because the problem affect all.  I am curious if the server go offline.  I know you said RDP works but we need to be sure.

Can you install ColaSoft Ping Tool on a workstation and ping the server AND the switch it's connected to?  You will see a break in the graph when it drop and the time as well to give you a better idea if this is the case.
Marc HutchinsonAuthor Commented:
running the software now.
Marc HutchinsonAuthor Commented:
Curious. when scrolling through the security logs, im seeing a bunch of logons from the same user at the same time

user - SBS$

log on like 20 times in a 1-2 second window........

then 30 seconds later another 20 or so log ins from the same user in like a 1-2 second window......

Also i'm seeing a logon with no account name and a security ID of NULL SID
Marc HutchinsonAuthor Commented:
Just happened again. steady ping to the server and switch. no packet loss.
Scott GorcesterCTOCommented:
Marc, did this coincide with a remote connection or no?

Scott
Marc HutchinsonAuthor Commented:
yes, i was RDPd into the server but it happens when im not RDPd into the server too. if it happens when im not logged into the server, i have noticed that a shutdown of a user PC who is logged into the network fixes it too.... its what leads me to believe that its user associated....

very perplexing.
Scott GorcesterCTOCommented:
Ok so more frequent when you are RDP'd in and clears up when you log off the RDP. And its just one users login from a PC that seems to affect this?

Are you using roaming profiles by chance?

Scott
Marc HutchinsonAuthor Commented:
yes, more frequent when i am logged into the server adding to the number of user accounts that are accessing the network. but it seems to happen with more frequency when the office has more people in it and on their PCs. we have a few construction supervisors who are in first thing in the morning and throughout the day. when there are more people in the office it seems to happen with greater regularity.

No roaming profiles.
Scott GorcesterCTOCommented:
You said all of the PC's have static IP addresses. I still feel like you may have an IP conflict that is wreaking havoc on your network. Is this a physical server or VM? What Nic/Nics are in the server, any dual or quad port. I had a very ugly situation a few years ago that we tracked down to a dual pot Nic rebooting at random, it was a known issue with Intel dual ports and cleared up after we replaced it.

Scott
Scott GorcesterCTOCommented:
In one case with a bad nic we also experienced the problem when the network was under extreme load.

I can't image a user login or logout would make everyones mapped drive be unavailable.

Scoot
Scott GorcesterCTOCommented:
Other than losing mapped drives are their any other symptoms, wondering if there is a network storm happening intermittantly.

Scott
Marc HutchinsonAuthor Commented:
this is a physical server. an HP Proliant ML350 G6 with dual port NICs on the MoBo. HP NC326i Dual Port Gigabit. one is disabled. i had planned to enable it and disable the one in use now to see if we have any change. I am also going to upgrade the firmware on the NetGear ProSafe switch tonight just for giggles....
Marc HutchinsonAuthor Commented:
no other issues. email flows fine, event logs are really clean except for an ASP.net warning, users can access their cad drawings over the network (when the drives are working)
Scott GorcesterCTOCommented:
Ok, I do think moving to the other network port would be wise. You might also open a case with HP complaining about odd behavior to see if they have any ideas. Did you say the firmware on the server is current?

Scott
Marc HutchinsonAuthor Commented:
yep. i did the PSP update a couple of weeks ago. it included updating the NIC Cards.
Scott GorcesterCTOCommented:
Hvae you tried disabling IPV6 on the PC's and the server?

Scott
Scott GorcesterCTOCommented:
Were your client devices cloned from a gold image?

Scott
Marc HutchinsonAuthor Commented:
Unchecking the IPV6 did something hinkey to the NIC. it stayed at identifying untill i rechecked it then it went back to showing our domain.

no, 99% of our PCs are Dell built.
Scott GorcesterCTOCommented:
There are not a lot of complaints on the web that relate to the problem you are having, one company was having this issue but it was random PC's not everyone at the same time. The fact that this affects everyone points more to the server or network as the common denominator. I did find one article that related to an SBS server that said their drive connectivity problems disapeared when they disabled IPv6 although I see other articles that state this can be problematic. I disable IPv6 on servers all the time and I beleive several of my SBS customers also have this disabled.

Scott
Marc HutchinsonAuthor Commented:
Im going to disable ipv6 tonight and reboot the server. ill see how that affects users tomorrow. i did notice that i lost outlook connection on my PC when i disconnected it earlier. ill keep you posted.
Scott GorcesterCTOCommented:
Marc HutchinsonAuthor Commented:
10-4

Thanks for your help Scott, ill keep you updated.....
David AtkinTechnical DirectorCommented:
Hi Marc,

Personally I wouldn't recommend disabling IPv6 on SBS.  Everything I've read has stated that its a bad idea.  Plus, there's no real reason to do it.

In addition to Scotts comments, can you access the server via the UNC path or IP address at the time of the problem?

Are the PC's on static DNS as well?  If so, are they pointing to the server?

Updating the Switch firmware is a good idea.
Wayne88Commented:
I agree with David, I wouldn't disable IPV6.  If anything you should set IPV4 to precede over IPV6 but don't totally disable it.

Marc, when lost connection to the mapped drive how long are you normally down for?  Is it always consistent (e.g. 5 min then it all comes back fine?)

You also mentioned construction workers around.  Was this issue apparent before the construction work or after?
Marc HutchinsonAuthor Commented:
IPv6 disabled for now. will monitor throughout the day

David: when the issue occurs, i can not browse with either the IP or UNC name of the server. Its just server connections though. i have a drive mapped to a PC in the office and i never loose connection to that one.

Wayne: we are usually down for roughly two minutes then it comes back up and resumes work as normal. As for construction workers around, I meant that we have people who aren't in the office all day. they come in the morning check email and then leave for most of the day. there is no actuall construction work being done at this time.
Marc HutchinsonAuthor Commented:
Just happened again. Just as i logged into the server the drives got disconnected. Things like this lead me to believe its user account related... Server hanging when trying to log out..... once i am logged out, the shared drives come back up.
David AtkinTechnical DirectorCommented:
Can you check to see if there are any scheduled tasks running around the time of the disconnection?

Any high disk load or anything?  Updates installing?

Anything at all in the event logs? - Warnings or errors
Wayne88Commented:
Hi Marc,

You mentioned you have 2 NICs?  Did you try teaming the NIC cards?  I would do it for load-balancing and automatic fail-over.  The access speed should improve too.

How many users do you have onsite?

Wayne
David AtkinTechnical DirectorCommented:
SBS2011 doesn't support NIC teaming.

However using the other network adaptor is worth a try - You'll need to run the Fix My Network wizard in the SBS Console once you've setup the IP etc.
Wayne88Commented:
Disagree!  It depends on the driver not the O.S and why wouldn't you want to do it?

I have enabled NIC teaming on all of my servers.  It's good for performance and it's also a fail-over protection.  For servers that are meant to reliably run 24/7 I don't understand why anyone wouldn't want to do this.  Please explain.

In this situation it can only improve the performance.  Marc, I recommend it.
David AtkinTechnical DirectorCommented:
The networking wizards in SBS are designed to work with a single network adaptor.  You will find that running any of the console network  wizards won't work and you'll have problems with remote access etc.  On a standard Server, I would 100% agree teaming is the way to go.  Not in SBS though.

 See below for reference:

https://technet.microsoft.com/en-us/library/supported-network-configuration-1.aspx
Marc HutchinsonAuthor Commented:
yep. next is using the other network adapter. i have it set up with the same IP information as the first adapter so i can just swap it over and disable the first one.
Wayne88Commented:
David, you provided a fair explanation and thank you.  From my experience, I have no problem running network teaming on SBS using the manufacturer software not Windows Networking Wizard but let's stick to MS specification in this case.

Marc, let's try using the other NIC and see if the problem persists.
David AtkinTechnical DirectorCommented:
No worries Wayne, we all have our experiences (Y)

Marc, let us know how you get on with the other NIC. Remember to run the FMNW after you set the IP on the new NIC and disabled the old one.
Marc HutchinsonAuthor Commented:
it seems to have gotten worse. i was out of the office for about 4 hours and i come back to people claiming that it was down for almost 20 minutes. again, no errors in the event log.

I am at a loss.....
Scott GorcesterCTOCommented:
Marc, I assume that you have not had the opportunity to replace or add a new nic yet? If the hardware is failing then unfortunately it may get worse with time. Also wonder if full power off reset might help. Is the server in a realitvely cool place?

Scott
Marc HutchinsonAuthor Commented:
i have not replaced the NIC yet. the server is in a well ventilated area and i have done many full reboots of it.
David AtkinTechnical DirectorCommented:
Again, nothing at all in the logs?

All auto services started?

Resources ok?

Any recent updates installed around the time that this issue started?
Marc HutchinsonAuthor Commented:
the only thing in the event logs is an asp warning. im not in a position to log into the server roght now but ill post the warning on monday.
Marc HutchinsonAuthor Commented:
all resources fine. all auto start services are up.
Wayne88Commented:
Hi Marc,

The only other thing is the NIC.  Let us know when you have the chance to replace it.  We're curious if the outcome will be different.

Wayne

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Marc HutchinsonAuthor Commented:
Putting a support ticket in with HP today. gotta love 24/7/365 CarePacks
Wayne88Commented:
Hope you can get to the bottom of this, let us know how it goes.  Good luck!
Marc HutchinsonAuthor Commented:
update: CarePack expired one month ago. Trying to get a repurchase approved and also trying to get a stand alone NIC approved.
Alan HardistyCo-OwnerCommented:
Make sure you have disabled the Power Save on the NIC settings - which is on by default on ALL Windows computers!

Click on Start> [Type] NCPA.CPL [Press Enter]> Right-Click on the LAN Adapter and Choose Properties> Click on the Configure Button> Click on the Power Tab and untick everything.  Click OK a few times to close the open Windows.

Give it a couple of days and see if that helps.
Marc HutchinsonAuthor Commented:
Just did Alan. Will keep monitoring it.
Marc HutchinsonAuthor Commented:
Update: After turning off sleep on the server NIC the issue happened again. I logged into the server and turned off indexing of that location. while the server was in the process of removing indexing from the specified drive, users experienced 6-7 more occurrences of the issue. all while logged into the server as ADMIN through an RDP session and watching the server remove indexing from everything. once indexing was turned off and i logged off the server we have had no more instances of the issue today.

Replacement NIC ordered and will be here next week.
Marc HutchinsonAuthor Commented:
Update - NIC replaced today. will monitor for the next few days and keep everyone updated.
Scott GorcesterCTOCommented:
Fingers crossed!

Scott
Scott GorcesterCTOCommented:
Marc, any further issues?

Scott
Marc HutchinsonAuthor Commented:
Issue has happened twice today. Not the NIC it appears.
Scott GorcesterCTOCommented:
wow, this is a tough one.
Alan HardistyCo-OwnerCommented:
Have you downloaded the latest ProLiant Support Pack for the server and upgraded everything?   (You will need an active HP Care Pack for the server to be able to download the very latest PSP though).
Marc HutchinsonAuthor Commented:
I re ran the PSP (9.10) last night and it had one missing update that it installed. i am monitoring it today and no disconnects yet. I also have the updated drivers for the new NIC i installed two days ago. I will install that tonight.
Alan HardistyCo-OwnerCommented:
Fingers crossed that either one helps.
Marc HutchinsonAuthor Commented:
drivers updated. will monitor for the next few days...
Marc HutchinsonAuthor Commented:
Update, when i first installed the NIC it automatically used default drivers and still gave me issues. when i re ran the PSP for the updated drivers then talked to HP and got the Latest drivers (the PSP had version 10 and the latest is 12) we have not had any more issues. I'm knocking on wood that this solves the issue.

Thanks everyone for your input.
Scott GorcesterCTOCommented:
Glad it appears that this is resolved.

Scott
Wayne88Commented:
Great, hope that's the fix. Cheers!
Alan HardistyCo-OwnerCommented:
Excellent news - always good to put such a random issue to bed.
Marc HutchinsonAuthor Commented:
And the issue has returned. when a user was trying to save a document to a shared folder on the drive, it locked up and killed the connection. is it possible to remove the File Services Role and re-add it to sbs2011 without it jacking everything up?
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