Server connection lost when connected via WAP200

Hi,
I have a small Windows SBS 2011 network where two WAP200 (hw-ver 1.0 sw-ver 2.0.6.0-ETSI) provides WLAN access to the network for my Win7 clients. If I connect one of the Win7 clients via one the the WAP200, open a pdf-file and leave it for one hour, and then try to scroll the document, then Acrobat reports an IO-error after 20 seconds. This does not occur if I connect directly to the LAN or via a 3Com AP instead. Similar problems occur if I open Outlook or IE.
It seems like a SMB2 session is created when I open the pdf-file, and that this session is lost for some reason. Is there some PM that kicks in and makes the client inaccessible from the server so that it considers the client gone ?
Regards
MatsW

Hi Jeffrey,
There's definitely something fishy with the WAP200. I can see the following: If I take a network trace on both my server and the client attached via WAP200 then I can see that suddenly ARP Requests from server doesn't reach the client. This lasts for about 5 minutes when traffic starts to pass thru.
So then I started "ping client -n 10000000' on the server to make sure I had a continous flow of traffic between client and server. Now the problem doesn't occur. But what is odd is that I can see that another client which is attached to the same WAP200 suddenly stops responding to ARP Requests, just as the first client when it didn't have ping running.
This may explain why the SMB2 session fails because if client doesn't respond to ARP Requests (because WAP200 drops connection for 5 minutes) then eventually the file handle is closed.
Do you have some suggestion on how to debug this ?
Kind regards
Mats

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I posted this question on StackOverflow (http://stackoverflow.com/questions/23798443/c-sharp-com-server-events-lost-when-raising-events-while-excel-is-in-edit-mode) but did not receive a good answer, so I'm trying my luck here.
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Excel VBA is the most common client of my COM server. I’ve found that when I raise COM events while Excel is in edit mode (e.g. a cell is being edited) the event is “lost”. Meaning, the VBA event handler is never called (even after the Excel
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Excel is out of edit mode?
I have tried:
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Calling the event delegate directly from a worker thread and from the main thread – event not raised on the client, no exceptions thrown on the server.
Pushing the event delegate onto a worker thread’s Dispatcher and invoking it synchronously – event not raised on the client, no exceptions thrown on the server.
Pushing the event delegate onto the main thread’s Dispatcher and invoking it synchronously and asynchronously – event not raised on the client, no exceptions thrown on the server.
Checking the status code of the Dispatcher.BeginInvoke call (using DispatcherOperation.Status) – the status is always ends with “Completed”, and is never in “Aborted” state.
Creating an out-of-proc C# COM server exe and tested raising the events from there – same result, event handler never called, no exceptions.
Since I get no indication that the event was not raised on the client, I cannot handle this situation in my code.
I have tested this with Excel 2010 and Excel 2013.
Here is a simple test case. The C# COM server:
namespace ComServerTest
public delegate void EventOneDelegate();
// Interface
[Guid("2B2C1A74-248D-48B0-ACB0-3EE94223BDD3"), Description("ManagerClass interface")]
[InterfaceType(ComInterfaceType.InterfaceIsDual)]
[ComVisible(true)]
public interface IManagerClass
[DispId(1), Description("Describes MethodAAA")]
String MethodAAA(String strValue);
[DispId(2), Description("Start thread work")]
String StartThreadWork(String strIn);
[DispId(3), Description("Stop thread work")]
String StopThreadWork(String strIn);
[Guid("596AEB63-33C1-4CFD-8C9F-5BEF17D4C7AC"), Description("Manager events interface")]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
[ComVisible(true)]
public interface ManagerEvents
[DispId(1), Description("Event one")]
void EventOne();
[Guid("4D0A42CB-A950-4422-A8F0-3A714EBA3EC7"), Description("ManagerClass implementation")]
[ComVisible(true), ClassInterface(ClassInterfaceType.None)]
[ComSourceInterfaces(typeof(ManagerEvents))]
public class ManagerClass : IManagerClass
private event EventOneDelegate EventOne;
private System.Threading.Thread m_workerThread;
private bool m_doWork;
private System.Windows.Threading.Dispatcher MainThreadDispatcher = null;
public ManagerClass()
// Assumes this is created on the main thread
MainThreadDispatcher = System.Windows.Threading.Dispatcher.CurrentDispatcher;
m_doWork = false;
m_workerThread = new System.Threading.Thread(DoThreadWork);
// Simple thread that raises an event every few seconds
private void DoThreadWork()
DateTime dtStart = DateTime.Now;
TimeSpan fiveSecs = new TimeSpan(0, 0, 5);
while (m_doWork)
if ((DateTime.Now - dtStart) > fiveSecs)
System.Diagnostics.Debug.Print("Raising event...");
try
if (EventOne != null)
// Tried calling the event delegate directly
EventOne();
// Tried synchronously invoking the event delegate from the main thread's dispatcher
MainThreadDispatcher.Invoke(EventOne, new object[] { });
// Tried asynchronously invoking the event delegate from the main thread's dispatcher
System.Windows.Threading.DispatcherOperation dispOp = MainThreadDispatcher.BeginInvoke(EventOne, new object[] { });
// Tried synchronously invoking the event delegate from the worker thread's dispatcher.
// Asynchronously invoking the event delegate from the worker thread's dispatcher did not work regardless of whether Excel is in edit mode or not.
System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke(EventOne, new object[] { });
catch (System.Exception ex)
// No exceptions were thrown when attempting to raise the event when Excel is in edit mode
System.Diagnostics.Debug.Print(ex.ToString());
dtStart = DateTime.Now;
// Method should be called from the main thread
[ComVisible(true), Description("Implements MethodAAA")]
public String MethodAAA(String strValue)
if (EventOne != null)
try
// Tried calling the event delegate directly
EventOne();
// Tried asynchronously invoking the event delegate from the main thread's dispatcher
System.Windows.Threading.DispatcherOperation dispOp = System.Windows.Threading.Dispatcher.CurrentDispatcher.BeginInvoke(EventOne, new object[] { });
// Tried synchronously invoking the event delegate from the main thread's dispatcher
System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke(EventOne, new object[] { });
catch (System.Exception ex)
// No exceptions were thrown when attempting to raise the event when Excel is in edit mode
System.Diagnostics.Debug.Print(ex.ToString());
return "";
return "";
[ComVisible(true), Description("Start thread work")]
public String StartThreadWork(String strIn)
m_doWork = true;
m_workerThread.Start();
return "";
[ComVisible(true), Description("Stop thread work")]
public String StopThreadWork(String strIn)
m_doWork = false;
m_workerThread.Join();
return "";
I register it using regasm:
%SystemRoot%\Microsoft.NET\Framework\v2.0.50727\regasm /codebase ComServerTest.dll /tlb:ComServerTest.tlb
Excel VBA client code:
Public WithEvents managerObj As ComServerTest.ManagerClass
Public g_nCounter As Long
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Set managerObj = New ComServerTest.ManagerClass
Dim dtStart As Date
dtStart = DateTime.Now
g_nCounter = 0
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managerObj.StartThreadWork ""
Do While True
DoEvents
' Loop for 20 secs
If ((DateTime.Now - dtStart) * 24 * 60 * 60) > 20 Then
' Stops the worker thread
managerObj.StopThreadWork ""
Exit Do
End If
Loop
Debug.Print "Done"
End Sub
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Set managerObj = New ComServerTest.ManagerClass
Debug.Print "Start"
' This call will raise the EventOne event
managerObj.MethodAAA ""
Debug.Print "Done"
End Sub
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Private Sub managerObj_EventOne()
Debug.Print "EventOne " & g_nCounter
g_nCounter = g_nCounter + 1
End Sub
This problem also occurs for a C++ MFC Automation server that raises COM events. If I raise the COM event from the main thread when Excel is in edit mode, the event handler is never called. No errors or exceptions are thrown on the server,
similar to my C# COM server. However, if I use the Global Interface Table to marshal the event sink interface from the main thread
back to the main thread, then invoking the event - it will block while Excel is in edit mode. (I also used COleMessageFilter to disable the busy dialog and not responding dialogs, otherwise I'd receive the exception:
RPC_E_CANTCALLOUT_INEXTERNALCALL It is illegal to call out while inside message filter.)
Knowing that, I tried to do the same on my C# COM server. I could instantiate the Global Interface Table (using the definition from pinvoke.net) and the message filter (using the IOleMessageFilter definition from MSDN). However, the event still
gets "lost" and does not block while Excel is in edit mode.
Here's my additional C# code to try to make use of the Global Interface Table:
namespace ComServerTest
// Global Interface Table definition from pinvoke.net
ComImport,
InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("00000146-0000-0000-C000-000000000046")
interface IGlobalInterfaceTable
uint RegisterInterfaceInGlobal(
[MarshalAs(UnmanagedType.IUnknown)] object pUnk,
[In] ref Guid riid);
void RevokeInterfaceFromGlobal(uint dwCookie);
[return: MarshalAs(UnmanagedType.IUnknown)]
object GetInterfaceFromGlobal(uint dwCookie, [In] ref Guid riid);
ComImport,
Guid("00000323-0000-0000-C000-000000000046") // CLSID_StdGlobalInterfaceTable
class StdGlobalInterfaceTable /* : IGlobalInterfaceTable */
public class ManagerClass : IManagerClass
//...skipped code already mentioned in earlier sample above...
//...also skipped the message filter code for brevity...
private Guid IID_IDispatch = new Guid("00020400-0000-0000-C000-000000000046");
private IGlobalInterfaceTable m_GIT = null;
public ManagerClass()
//...skipped code already mentioned in earlier sample above...
m_GIT = (IGlobalInterfaceTable)new StdGlobalInterfaceTable();
public void FireEventOne()
// Using the GIT to marshal the (event?) interface from the main thread back to the main thread (like the MFC Automation server).
// Should we be marshalling the ManagerEvents interface pointer instead? How do we get at it?
uint uCookie = m_GIT.RegisterInterfaceInGlobal(this, ref IID_IDispatch);
ManagerClass mgr = (ManagerClass)m_GIT.GetInterfaceFromGlobal(uCookie, ref IID_IDispatch);
mgr.EventOne(); // when Excel is in edit mode, event handler is never called and does not block, event is "lost"
m_GIT.RevokeInterfaceFromGlobal(uCookie);
I’d like my C# COM server to behave in a similar way to the MFC Automation server. Is this possible? I think I should be registering the ManagerEvents interface pointer in the GIT but I don't know how to get at it? I tried using Marshal.GetComInterfaceForObject(this,
typeof(ManagerEvents)) but that just throws an exception: System.InvalidCastException: Specified cast is not valid.
Thanks.

Hi Jason-F,
I’ve found that when I raise COM events while Excel is in edit mode (e.g. a cell is being edited) the event is “lost”. Meaning,
the VBA event handler is never called (even after the Excel edit mode is finished) and the call to the C# event delegate passes through and fails silently with no exceptions being thrown.
Do you mean you didn't raise EventOne event? EventOne handler like following?
' EventOne handler
Private Sub managerObj_EventOne()
Debug.Print "EventOne " & g_nCounter
g_nCounter = g_nCounter + 1
End Sub
After test your code, here is my screenshot
And here is my execute log in C# ComServerTest.
ManagerClass1/1/2015 5:48:11 PM
DoThreadWork()1/1/2015 5:48:12 PM
ManagerClass_EventOne()1/1/2015 5:48:17 PM
ManagerClass_EventOne()1/1/2015 5:48:22 PM
ManagerClass_EventOne()1/1/2015 5:48:27 PM
ManagerClass_EventOne()1/1/2015 5:48:32 PM
ManagerClass_EventOne()1/1/2015 5:48:37 PM
ManagerClass_EventOne()1/1/2015 5:48:42 PM
ManagerClass1/1/2015 5:49:56 PM
DoThreadWork()1/1/2015 5:49:56 PM
ManagerClass_EventOne()1/1/2015 5:50:01 PM
ManagerClass1/1/2015 5:50:04 PM
If i misunderstand you, please feel free to let me know.
Best regards,
kristin
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Dump continued from file: /data02/oramisc/diag/rdbms/dpmdbp/dpmdbp/trace/dpmdbp_ora_13503.trc
ORA-00600: intern felkod, argument: [15570], [], [], [], [], [], [], [], [], [], [], []
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*** 2011-10-18 09:52:25.445
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----- Current SQL Statement for this session (sql_id=7a76281h0tr2p) -----
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This note gives a brief overview of bug 12368039.
The content was last updated on: 18-MAY-2011
Click here for details of each of the sections below.
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Message was edited by: Dave Dahle

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If that doesn't help, tap Settings > General > Reset > Reset Network Settings
You may have to re enter your Wi-Fi password.
If nothing above has helped, try here > iOS: Troubleshooting Wi-Fi networks and connections
iOS: Wi-Fi settings grayed out or dim

Router connection lost after connecting modem

Router: WRT54GX4
Background: My desktop PC had been connected to the internet through my router and DSL modem just fine. But I forgot my router password, so I reset the router.
Situation: Now my PC communicates with the router fine when the modem is NOT connected to the router (I can ping the router, access the router's Utility screens, etc.). Once I connect modem to the router, though, my PC can no longer ping or see the router. My PC will still connect fine to the internet when directly connected to the modem.
Attempted Fixes: I've believe I've tried every combination of turning off/turning on the equipment. For example, while I have a good PC/router connection, I've connected the modem to the router (and lost the router connection). Then I tried starting out with a good PC/router connection, powered off the router, connected the modem, then powered the router back on (and lost the network connection). I've restarted the PC after connecting the modem to the router, et cetera, et cetera. Every scenarion I try ends up with me losing the router connection to the PC.
Any suggestions would be appreciated.
Message Edited by Mark73Online on 08-26-2007 11:51 AM

After you reset the router to factory defaults, you need to setup the router again. Use the setup disk that came with the router, or setup the router manually if you prefer. It sounds like your "Intenet Connection Type" is not setup correctly.
Please state your ISP.
Also state the make and model of your modem.
Do you have cable modem, or DSL, or ADSL ?
Did your ISP give you a PPPoE user name and password?

Connection failure when connecting to the net with...

I hope someone can help me. I have got Nokia PC suite on my PC. I often use it to connect to the net. Just recently I had a few viruses on my pc and now since they have been cleaned off I keep getting a connection failure when I try to connect. I have tried uninstalling and reinstalling my software but nothing seems to help. I know it is something to do with my pc as I have tried four different phones that do work on other pc's, just not this one.
I have checked to make sure all the modem settings are right and that the phone is detected as a modem.
What should I try that might help solve this??
Thanks
Katherine

Make sure you have entered the access point in the one touch access settings, enter the settings maually and try to connect.
If a reply has solved your problem click Accept as solution button, doing it will help others know the solution. Thanks.

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