NetworkInterface.GetAllNetworkInterfaces causes Invalid access to memory location

I have this piece of code to get a NetworkInterface with a specific name:

string myIf = "Local Area Connection";

NetworkInterface ni = NetworkInterface.GetAllNetworkInterfaces().FirstOrDefault(i => i.Name == myIf);

However, this throws a NetworkInformationException: Invalid access to memory location with an ErrorCode of 998 (which means exactly the same as the exception says).

System.Net.NetworkInformation.NetworkInformationException was unhandled  

 ErrorCode=998

 HResult=-2147467259

 Message=Invalid  access to memory location

 NativeErrorCode=998

 Source=System  

 StackTrace:

      at System.Net.NetworkInformation.SystemNetworkInterface.GetNetworkInterfaces()

      at System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

      at MyApp.CheckIfNetworkOnline(Object state)

      at System.Threading.TimerQueueTimer.CallCallbackInContext(Object state)

      at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.TimerQueueTimer.CallCallback()

      at System.Threading.TimerQueueTimer.Fire()

      at System.Threading.TimerQueue.FireNextTimers()

      at System.Threading.TimerQueue.AppDomainTimerCallback()   

 InnerException:

.NET documentation claims that this is due to "A Windows system function call failed" or "when a call to a Win32 function fails".

This is on .NET 4.5.2, the network interface does exist, and the application is already running as Administrator.

What can cause this exception to appear, and is there anything that can be done to fix it?

edited Jun 2 '17 at 15:21

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

Install LINQPad and see if simply evaluating the expression NetworkInterface.GetAllNetworkInterfaces() is already problematic. If so, you may have a network driver that isn't playing nice in all circumstances. See if netsh interface show interface shows anything funky.

– Jeroen Mostert
Jun 2 '17 at 15:20

@ScottChamberlain Done!

– GTHvidsten
Jun 2 '17 at 15:21

If, as your method name suggests, you are merely interested in whether a network is available, you may want to use GetIsNetworkAvailable instead. You cannot, in general, rely on the appropriate connection being named "Local Area Connection". (On my machine, it's called "Ethernet", but really, it could be anything. All you should care about is that it's not a loopback or tunnel interface and leave the rest to the route table.)

– Jeroen Mostert
Jun 2 '17 at 15:24

@JeroenMostert I can't use GetIsNetworkAvailable because there are several network interfaces on this PC, and I need to check if one particular interface is available and up, not if any interface is up.

– GTHvidsten
Jun 2 '17 at 15:35

Error code 998 is very, very nasty. The DllMain entrypoint of an unmanaged DLL failed with an AccessViolationException. Very much a dirty machine problem, so you'd start by trying this on another machine to verify that this only happens on this one. Then it could be useful to unable unmanaged debugging and forcing the debugger to stop on a Win32 exception, helps you identify the specific DLL. Tinkering with the installed anti-malware product tends to be useful.

– Hans Passant
Jun 2 '17 at 15:55

add a comment |

I have this piece of code to get a NetworkInterface with a specific name:

string myIf = "Local Area Connection";

NetworkInterface ni = NetworkInterface.GetAllNetworkInterfaces().FirstOrDefault(i => i.Name == myIf);

However, this throws a NetworkInformationException: Invalid access to memory location with an ErrorCode of 998 (which means exactly the same as the exception says).

System.Net.NetworkInformation.NetworkInformationException was unhandled  

 ErrorCode=998

 HResult=-2147467259

 Message=Invalid  access to memory location

 NativeErrorCode=998

 Source=System  

 StackTrace:

      at System.Net.NetworkInformation.SystemNetworkInterface.GetNetworkInterfaces()

      at System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

      at MyApp.CheckIfNetworkOnline(Object state)

      at System.Threading.TimerQueueTimer.CallCallbackInContext(Object state)

      at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.TimerQueueTimer.CallCallback()

      at System.Threading.TimerQueueTimer.Fire()

      at System.Threading.TimerQueue.FireNextTimers()

      at System.Threading.TimerQueue.AppDomainTimerCallback()   

 InnerException:

.NET documentation claims that this is due to "A Windows system function call failed" or "when a call to a Win32 function fails".

This is on .NET 4.5.2, the network interface does exist, and the application is already running as Administrator.

What can cause this exception to appear, and is there anything that can be done to fix it?

edited Jun 2 '17 at 15:21

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

Install LINQPad and see if simply evaluating the expression NetworkInterface.GetAllNetworkInterfaces() is already problematic. If so, you may have a network driver that isn't playing nice in all circumstances. See if netsh interface show interface shows anything funky.

– Jeroen Mostert
Jun 2 '17 at 15:20

@ScottChamberlain Done!

– GTHvidsten
Jun 2 '17 at 15:21

If, as your method name suggests, you are merely interested in whether a network is available, you may want to use GetIsNetworkAvailable instead. You cannot, in general, rely on the appropriate connection being named "Local Area Connection". (On my machine, it's called "Ethernet", but really, it could be anything. All you should care about is that it's not a loopback or tunnel interface and leave the rest to the route table.)

– Jeroen Mostert
Jun 2 '17 at 15:24

@JeroenMostert I can't use GetIsNetworkAvailable because there are several network interfaces on this PC, and I need to check if one particular interface is available and up, not if any interface is up.

– GTHvidsten
Jun 2 '17 at 15:35

Error code 998 is very, very nasty. The DllMain entrypoint of an unmanaged DLL failed with an AccessViolationException. Very much a dirty machine problem, so you'd start by trying this on another machine to verify that this only happens on this one. Then it could be useful to unable unmanaged debugging and forcing the debugger to stop on a Win32 exception, helps you identify the specific DLL. Tinkering with the installed anti-malware product tends to be useful.

– Hans Passant
Jun 2 '17 at 15:55

add a comment |

I have this piece of code to get a NetworkInterface with a specific name:

string myIf = "Local Area Connection";

NetworkInterface ni = NetworkInterface.GetAllNetworkInterfaces().FirstOrDefault(i => i.Name == myIf);

However, this throws a NetworkInformationException: Invalid access to memory location with an ErrorCode of 998 (which means exactly the same as the exception says).

System.Net.NetworkInformation.NetworkInformationException was unhandled  

 ErrorCode=998

 HResult=-2147467259

 Message=Invalid  access to memory location

 NativeErrorCode=998

 Source=System  

 StackTrace:

      at System.Net.NetworkInformation.SystemNetworkInterface.GetNetworkInterfaces()

      at System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

      at MyApp.CheckIfNetworkOnline(Object state)

      at System.Threading.TimerQueueTimer.CallCallbackInContext(Object state)

      at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.TimerQueueTimer.CallCallback()

      at System.Threading.TimerQueueTimer.Fire()

      at System.Threading.TimerQueue.FireNextTimers()

      at System.Threading.TimerQueue.AppDomainTimerCallback()   

 InnerException:

.NET documentation claims that this is due to "A Windows system function call failed" or "when a call to a Win32 function fails".

This is on .NET 4.5.2, the network interface does exist, and the application is already running as Administrator.

What can cause this exception to appear, and is there anything that can be done to fix it?

edited Jun 2 '17 at 15:21

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

I have this piece of code to get a NetworkInterface with a specific name:

string myIf = "Local Area Connection";

NetworkInterface ni = NetworkInterface.GetAllNetworkInterfaces().FirstOrDefault(i => i.Name == myIf);

However, this throws a NetworkInformationException: Invalid access to memory location with an ErrorCode of 998 (which means exactly the same as the exception says).

System.Net.NetworkInformation.NetworkInformationException was unhandled  

 ErrorCode=998

 HResult=-2147467259

 Message=Invalid  access to memory location

 NativeErrorCode=998

 Source=System  

 StackTrace:

      at System.Net.NetworkInformation.SystemNetworkInterface.GetNetworkInterfaces()

      at System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

      at MyApp.CheckIfNetworkOnline(Object state)

      at System.Threading.TimerQueueTimer.CallCallbackInContext(Object state)

      at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

      at System.Threading.TimerQueueTimer.CallCallback()

      at System.Threading.TimerQueueTimer.Fire()

      at System.Threading.TimerQueue.FireNextTimers()

      at System.Threading.TimerQueue.AppDomainTimerCallback()   

 InnerException:

.NET documentation claims that this is due to "A Windows system function call failed" or "when a call to a Win32 function fails".

This is on .NET 4.5.2, the network interface does exist, and the application is already running as Administrator.

What can cause this exception to appear, and is there anything that can be done to fix it?

c# .net winapi network-interface

edited Jun 2 '17 at 15:21

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

edited Jun 2 '17 at 15:21

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

edited Jun 2 '17 at 15:21

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

asked Jun 2 '17 at 15:13

GTHvidsten

1,10111034

Install LINQPad and see if simply evaluating the expression NetworkInterface.GetAllNetworkInterfaces() is already problematic. If so, you may have a network driver that isn't playing nice in all circumstances. See if netsh interface show interface shows anything funky.

– Jeroen Mostert
Jun 2 '17 at 15:20

@ScottChamberlain Done!

– GTHvidsten
Jun 2 '17 at 15:21

If, as your method name suggests, you are merely interested in whether a network is available, you may want to use GetIsNetworkAvailable instead. You cannot, in general, rely on the appropriate connection being named "Local Area Connection". (On my machine, it's called "Ethernet", but really, it could be anything. All you should care about is that it's not a loopback or tunnel interface and leave the rest to the route table.)

– Jeroen Mostert
Jun 2 '17 at 15:24

@JeroenMostert I can't use GetIsNetworkAvailable because there are several network interfaces on this PC, and I need to check if one particular interface is available and up, not if any interface is up.

– GTHvidsten
Jun 2 '17 at 15:35

Error code 998 is very, very nasty. The DllMain entrypoint of an unmanaged DLL failed with an AccessViolationException. Very much a dirty machine problem, so you'd start by trying this on another machine to verify that this only happens on this one. Then it could be useful to unable unmanaged debugging and forcing the debugger to stop on a Win32 exception, helps you identify the specific DLL. Tinkering with the installed anti-malware product tends to be useful.

– Hans Passant
Jun 2 '17 at 15:55

add a comment |

Install LINQPad and see if simply evaluating the expression NetworkInterface.GetAllNetworkInterfaces() is already problematic. If so, you may have a network driver that isn't playing nice in all circumstances. See if netsh interface show interface shows anything funky.

– Jeroen Mostert
Jun 2 '17 at 15:20

@ScottChamberlain Done!

– GTHvidsten
Jun 2 '17 at 15:21

If, as your method name suggests, you are merely interested in whether a network is available, you may want to use GetIsNetworkAvailable instead. You cannot, in general, rely on the appropriate connection being named "Local Area Connection". (On my machine, it's called "Ethernet", but really, it could be anything. All you should care about is that it's not a loopback or tunnel interface and leave the rest to the route table.)

– Jeroen Mostert
Jun 2 '17 at 15:24

@JeroenMostert I can't use GetIsNetworkAvailable because there are several network interfaces on this PC, and I need to check if one particular interface is available and up, not if any interface is up.

– GTHvidsten
Jun 2 '17 at 15:35

Error code 998 is very, very nasty. The DllMain entrypoint of an unmanaged DLL failed with an AccessViolationException. Very much a dirty machine problem, so you'd start by trying this on another machine to verify that this only happens on this one. Then it could be useful to unable unmanaged debugging and forcing the debugger to stop on a Win32 exception, helps you identify the specific DLL. Tinkering with the installed anti-malware product tends to be useful.

– Hans Passant
Jun 2 '17 at 15:55

Install LINQPad and see if simply evaluating the expression NetworkInterface.GetAllNetworkInterfaces() is already problematic. If so, you may have a network driver that isn't playing nice in all circumstances. See if netsh interface show interface shows anything funky.

– Jeroen Mostert
Jun 2 '17 at 15:20

@ScottChamberlain Done!

– GTHvidsten
Jun 2 '17 at 15:21

If, as your method name suggests, you are merely interested in whether a network is available, you may want to use GetIsNetworkAvailable instead. You cannot, in general, rely on the appropriate connection being named "Local Area Connection". (On my machine, it's called "Ethernet", but really, it could be anything. All you should care about is that it's not a loopback or tunnel interface and leave the rest to the route table.)

– Jeroen Mostert
Jun 2 '17 at 15:24

@JeroenMostert I can't use GetIsNetworkAvailable because there are several network interfaces on this PC, and I need to check if one particular interface is available and up, not if any interface is up.

– GTHvidsten
Jun 2 '17 at 15:35

Error code 998 is very, very nasty. The DllMain entrypoint of an unmanaged DLL failed with an AccessViolationException. Very much a dirty machine problem, so you'd start by trying this on another machine to verify that this only happens on this one. Then it could be useful to unable unmanaged debugging and forcing the debugger to stop on a Win32 exception, helps you identify the specific DLL. Tinkering with the installed anti-malware product tends to be useful.

– Hans Passant
Jun 2 '17 at 15:55

add a comment |

1 Answer
1

active

oldest

votes

I had the same issue with my 32-bit site and following steps solved my problem.

Open IIS

Expand your machine name on the left

Select "Application Pools"

Select the Application Pool of your site

On the right in the actions select "Advanced Settings"

In the General Change "Enable 32-Bit Applications" to false and press OK

On the right in the actions select "Advanced Settings" again.

In the General Change "Enable 32-Bit Applications" to true and press OK

answered Nov 18 '18 at 5:44

vahid

1364

add a comment |

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1 Answer
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active

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1 Answer
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active

oldest

votes

I had the same issue with my 32-bit site and following steps solved my problem.

Open IIS

Expand your machine name on the left

Select "Application Pools"

Select the Application Pool of your site

On the right in the actions select "Advanced Settings"

In the General Change "Enable 32-Bit Applications" to false and press OK

On the right in the actions select "Advanced Settings" again.

In the General Change "Enable 32-Bit Applications" to true and press OK

answered Nov 18 '18 at 5:44

vahid

1364

add a comment |

I had the same issue with my 32-bit site and following steps solved my problem.

Open IIS

Expand your machine name on the left

Select "Application Pools"

Select the Application Pool of your site

On the right in the actions select "Advanced Settings"

In the General Change "Enable 32-Bit Applications" to false and press OK

On the right in the actions select "Advanced Settings" again.

In the General Change "Enable 32-Bit Applications" to true and press OK

answered Nov 18 '18 at 5:44

vahid

1364

add a comment |

I had the same issue with my 32-bit site and following steps solved my problem.

Open IIS

Expand your machine name on the left

Select "Application Pools"

Select the Application Pool of your site

On the right in the actions select "Advanced Settings"

In the General Change "Enable 32-Bit Applications" to false and press OK

On the right in the actions select "Advanced Settings" again.

In the General Change "Enable 32-Bit Applications" to true and press OK

answered Nov 18 '18 at 5:44

vahid

1364

I had the same issue with my 32-bit site and following steps solved my problem.

Open IIS

Expand your machine name on the left

Select "Application Pools"

Select the Application Pool of your site

On the right in the actions select "Advanced Settings"

In the General Change "Enable 32-Bit Applications" to false and press OK

On the right in the actions select "Advanced Settings" again.

In the General Change "Enable 32-Bit Applications" to true and press OK

answered Nov 18 '18 at 5:44

vahid

1364

answered Nov 18 '18 at 5:44

vahid

1364

answered Nov 18 '18 at 5:44

vahid

1364

answered Nov 18 '18 at 5:44

vahid

1364

add a comment |

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