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Windows 7 and Server 2008 R2 Standard Authentication

Posted on 2013-06-05
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Last Modified: 2013-07-09
Hello,

I am having an issue with our Server 2008 R2 Standard DC and machines running Windows 7 or later.

Our environment consists of one server, the 08 R2, and it acts as our AD, DHCP, DNS, Fileserver, ISS Server, and Print Server.

The issues we are seeming to have is that clients will receive "There are currently no logon servers available to service the logon request" at random times, which after 15-20 seconds will no longer occur and they can log in without problems. Also, as part of our environment we have 2 machines running Server 2008 R2 that are using NComputing software to act as though they are independent Windows 7 Machines. The error received on these machines is "No RPC Server Available" when trying to log on.

From what I have noticed the server is losing connection to the clients and having to re-establish a connection before it can proceed with the desired action. Normally if I can log on as a local admin, ping the server, then all is well.

I have tried changing the registry setting on the server of the LanmanServer Parameter "autodisconnect" and changed it to "ffffffff", removing the 15 minute timeout. This still has not solved our problem.

Other issues that I have noticed is when remotely connected to the server (mstsc) from my machine it will randomly lose connection and have to re-establish. And also, clients are seeing a red "X" over their network share at different times throughout the day, all random, which normally disappears when they click on their shared drive. Also, (This list gets longer the more I look into it) at random times our clients will receive issues with the DNS server while surfing the internet as it will give them an Unable to Connect error, generally this resolves itself in a short time frame.


I know there is bound to be some issue occurring as these are availability problems for most as these issues always seem to occur at the most in-opportune times. Any help would be greatly appreciated.


Thanks,

Richard
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Question by:R1CH4RD25
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by:John Hurst
ID: 39222481
Are you running out of CAL's or Remote Connection licenses?  This could explain what you are seeing

... Thinkpads_User
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Author Comment

by:R1CH4RD25
ID: 39222528
On the 2 '08 Servers running N-Computing? Otherwise I am the only user that remotes into the server. Everyone else just used it as a Domain Controller to logon to our system. A thought I have had for the NComputing RCP Server Unavailable is that the CALs are housed on one machine, and perhaps it is not able to see it on the network.


Otherwise, since this is a 2008 R2 machine, everything that I have ever found is that you do not need to setup CAL's for this unless it is a terminal server, which it  is not. Perhaps I am wrong? I believe (and I could be wrong), is that I was told that we just needed the CAL's purchased for the number of devices that we would have on our machine and that its not really an installed basis, its one of those things where you just better not have any more machines on the server as you do CAL's.


Plus, currently we only have 25 clients connected, I thought maybe naming was an issue within the setup so have taken this summer time (This is at a school district) to rename and am currently working on getting all machines back on the system.


This is my first setup of a network, and possibly I just didn't configure something correctly, however off of everything I have searched through I have done what all others do in tutorials for setup of their Servers.
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by:John Hurst
ID: 39222772
I think you need to set up CAL's (we do that for clients) although they might be included in your price.  At least check it out. I once forgot to install CAL's (earlier server) and people coming in later could not log on.  At least check out this angle.

 I thought maybe naming was an issue within the setup

Could be. I do not run into any naming issues because I keep all names unique.

... Thinkpads_User
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Author Comment

by:R1CH4RD25
ID: 39222787
Checked on that and they are saying Server 08 does not use CAL's the same as 03 did.

Naming was our domain, users would log on to SchoolISD but the end of the system names would have sisd.local attached instead of schoolisd.local. In which the server name was sisd. (These are examples of course)

So I corrected that thinking maybe it was getting confused with naming, but still no go.
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by:John Hurst
ID: 39222882
I am not certain about the CAL's. We are just installing a Server 2012 and it comes with 10 no charge CAL's. I don't know yet whether they will control connections or not.

If not CAL's and not names, I am not sure what software would knock out users.

Check on AD in users setup for time of day use and other possible restrictions.

Check your switches and network setup for any glitches or restrictions.
.... Thinkpads_User
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Author Comment

by:R1CH4RD25
ID: 39234899
Checked AD for time of day / restrictions. Currently there isn't anything that should cause problems.


Nothing has changed in terms of switches and network setup overall from the '03 server that this replaced. It happened as soon as we hooked up the '08 server.


It is either dropping connection or the DNS on the server is having issues. A major issue that client machines see is the inability to resolve web addresses. Using the "Diagnose Connection Issue" button on Internet Explorer however always comes back saying it could not find a problem, then like magic it seems, all is well for a while.  Its not that this problem causes a huge down time, unless someone cannot logon due to RPC Server Unavailable, but it is something that I know shouldn't be the "norm" and happen this often.
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by:John Hurst
ID: 39234923
It is either dropping connection or the DNS on the server is having issues

At this point, I do not have any fool-proof answers. Try running Wireshark on the connection to see if you can determine where it is dropping and that might lead you to why. Since there are multiple users with connections dropped, the issue would seem to be in the network or in the server itself.

.... Thinkpads_User
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Author Comment

by:R1CH4RD25
ID: 39234935
Thanks, I will dig into Wireshark and see what I need to look for.  Any possible suggestions? I haven't ever used Wireshark before, so am not 100% sure what kind of info I am looking for.
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John Hurst earned 500 total points
ID: 39234945
Wireshark is a packet sniffing tool. I use CommView (not free). It can show you packets and I think it can show you contents of selected packets.

So what you are looking for is a dropped connection and then what is in the packet when it dropped.

Probably the best thing to do is install it on a machine and get familiar with it.

... Thinkpads_User
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Author Closing Comment

by:R1CH4RD25
ID: 39310650
Ended up finding several dropped DNS requests, so as quick fix that will stay in place for now I setup a second DNS server to run along side main AD/DC. Working like a charm so far.
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by:John Hurst
ID: 39310902
@R1CH4RD25 - Thanks for the update and I was happy to work with you on this.

... Thinkpads_User
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