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Do you have the server set to auto negotiate the flow rate? If you do during a high usage time it may have to disconnect a user to modify their connection speed to accommodate the extra users. &nbsp;
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I haven't changed any default settings for auto negotiate. &nbsp;Where would this be set?<br />
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This seems to happen at times of low traffic also when there are only 5-10 users connected.<br />
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Is this happening to only specific PC's? It may be easier, if thats the case, to just adjust the flow rate on the PC end as opposed to screwing with default server settings. 
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Yes, there are some PC's which never have this disconnect issue and there are others that at times it happens every 5-10 minutes. &nbsp;But those same users are connected to an exchange server over a VPN and that doesn't drop when the disconnect happens.<br />
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At one location in particular it happens more often but it is not isolated to that location.<br />
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I don't think it is a server issue because I connected some of those users to a brand new server and they still had disconnect issues.
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Lets test this on the problem child PC. <br />
goto start<br />
right click on my computer<br />
goto manage, <br />
goto device manager<br />
expand Network Adapters<br />
find your NIC and goto the properties<br />
click on the advanced tab and goto Speed and Duplex<br />
under that lets try to set it to 100mb full to see what happens. 
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I have made that change to 2 of the computers experiencing this issue and will update once I have a chance to monitor them.<br />
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Thanks for all your help.
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I made those changes to the 2 computers but they are still showing the same behavior.
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Hrmmm do you have a timeout setting on your firewall? Also does this disconnect happen when say a Screen Saver kicks in? Or after a idle period?
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We changed the timeout on the firewall rule for Port 3389 to 500 minutes a while back but that didn't help.<br />
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The disconnect happens randomly. &nbsp;Most of the time in the middle of using another application locally. &nbsp;We are only using one app through TS Remote App (but it also disconnects in a regular TS Session).<br />
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The RDP settings on the server are set to not disconnect a session because of inactivity.
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What firewall are you running?
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The Datacenter has a Sonicwall NSA 3500 and the remote location that is having the most problems has a Sonicwall TZ-170.
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Yes, it is set to 500 minutes on the NSA 3500. &nbsp;The UDP timeout is set at the default of 30 seconds.<br />
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Also, on the first tab &quot;Allow Fragmented Packets&quot; was unchecked, I checked it now just to see if that makes a difference.
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Have you checked the server logs to see if the server still sees the user is still listed as activ e during these &nbsp;disconnect periods? I have never had this issue not resolved with a resetting of the sonicwall timeout rules. So now i have to troubleshoot this a bit more heh. 
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Just as a side note...have you verified that the NIC drivers are all up to date on the client side PC's? &nbsp;
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Yeah, I updated the NIC drivers on one of the PC's and had no effect.<br />
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When I'm monitoring the TS Manager I can see the status of the session quickly change to Disconnected and right back to Active within 1-2 seconds.<br />
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Is there another location for TS logs? &nbsp;Nothing is logged to Event Viewer &gt;&nbsp;Custom Views &gt;&nbsp;Server Roles &gt;&nbsp;Terminal Services when this happens.<br />
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My next test is going to hook up a laptop that is having the disconnect issue outside the sonicwall to see if the disconnects stop. &nbsp;If they do then it might be an issue to bring up with sonicwall because Microsoft hasn't been able to find anything.
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Ya was going to suggest a eliminating the firewall so we can take that off the plate if thats not the cause. Please let me know what happens. And no you are in the right place for the logs. 
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Last night,we swapped out the TZ-170 for a new TZ-180 and changed the TCP timeout on the new 180 under Firewall &gt;&nbsp;Advanced to a higher number and haven't had the issue in over 24 hours.<br />
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I'm keep my fingers crossed that the problem is gone for good. &nbsp;Now I have to work through some performance issues.<br />
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Thanks for taking your time to help out.
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<div class="content wysiwyg-content">
We currently have a Windows 2008 box that is running Terminal Services for 30-40 users.<br />
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We are running into an issue with some users at different physical locations where there session will disconnect for about 1-3 seconds and quickly reconnect. &nbsp;While it is doing this it flashes the &quot;Attempting to reconnect to server, Try 1 of 20, etc.)<br />
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The bad part is that it is very random, sometimes goes away for a while and it doesn't affect all users. <br />
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One location is particularly worse than others but it even stops happening in that location at certain times.<br />
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I've had a ticket open with Microsoft for 2 weeks and they can't find anything.<br />
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The only way I, as admin, can tell it is happening is by crosschecking the original login time via terminal services manager and looking at the event viewer I can see the printer mappings deleting when the disconnect happens.<br />
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We currently have a Windows 2008 box that is running Terminal Services for 30-40 users.

We are running into an issue with some users at different physical locations where there session will disconnect for about 1-3 seconds and quickly reconnect.  While it is doing this it flashes the "Attempting to reconnect to server, Try 1 of 20, etc.)

The bad part is that it is very random, sometimes goes away for a while and it doesn't affect all users. 

One location is particularly worse than others but it even stops happening in that location at certain times.

I've had a ticket open with Microsoft for 2 weeks and they can't find anything.

The only way I, as admin, can tell it is happening is by crosschecking the original login time via terminal services manager and looking at the event viewer I can see the printer mappings deleting when the disconnect happens.



Windows 2008 Terminal Services Disconnect and Reconnect Issue

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.