Invalid ViewState Problems

[=?Utf-8?B?R2lsZXMgUGFwd29ydGg=?=]

I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?QXJpcyBIb3ViYXZsaXM=?=]

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.

Thanks,
Aris

"Giles Papworth" wrote:

I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?R2lsZXMgUGFwd29ydGg=?=]

Hi Aris,

These machines are definatly not part of a web farm and the objects are
definatly serializable.
I have changed my machine config to make sure that isn't causing the problem
however if i do that, the viewstate problem goes away and another appears.
Strangly enough it is only this one web app. All the others seem to work fine.

"Aris Houbavlis" wrote:

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.

Thanks,
Aris

"Giles Papworth" wrote:

I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?R2lsZXMgUGFwd29ydGg=?=]

Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.

"Aris Houbavlis" wrote:

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.

Thanks,
Aris

"Giles Papworth" wrote:

I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?QXJpcyBIb3ViYXZsaXM=?=]

Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />

Aris

"Giles Papworth" wrote:

Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.

"Aris Houbavlis" wrote:

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.

Thanks,
Aris

"Giles Papworth" wrote:

I seem to be getting this error message all of a sudden on one of my web apps:
>
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60
>
[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102
>
[HttpException (0x80004005): Invalid_Viewstate
>
>
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?R2lsZXMgUGFwd29ydGg=?=]

What section in the web.config does that go in?

"Aris Houbavlis" wrote:

Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />

Aris

"Giles Papworth" wrote:

Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.

"Aris Houbavlis" wrote:

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.
>
Thanks,
Aris
>
"Giles Papworth" wrote:
>
I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate


And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?QXJpcyBIb3ViYXZsaXM=?=]

<configuration>
<system.web>
<pages buffer="true" ...
...
...
...
...
</system.web>
</configuration>
"Giles Papworth" wrote:

What section in the web.config does that go in?

"Aris Houbavlis" wrote:

Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />

Aris

"Giles Papworth" wrote:

Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.
>
"Aris Houbavlis" wrote:
>
Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.

Thanks,
Aris

"Giles Papworth" wrote:

I seem to be getting this error message all of a sudden on one of my web apps:
>
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60
>
[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102
>
[HttpException (0x80004005): Invalid_Viewstate
>
>
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?R2lsZXMgUGFwd29ydGg=?=]

Thanks for that but it seems to have made no difference.

"Aris Houbavlis" wrote:

<configuration>
<system.web>
<pages buffer="true" ...
...
...
...
...
</system.web>
</configuration>
"Giles Papworth" wrote:

What section in the web.config does that go in?

"Aris Houbavlis" wrote:

Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />
>
Aris
>
"Giles Papworth" wrote:
>
Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.

"Aris Houbavlis" wrote:

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.
>
Thanks,
Aris
>
"Giles Papworth" wrote:
>
I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate


And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?QXJpcyBIb3ViYXZsaXM=?=]

what state server setting do u have?
InProc,
SqlServer,
StateServer,
Off (Disables session state)

<system.web>
<sessionState mode="StateServer"
stateConnectionString="tcpip=SampleStateServer:424 24"
cookieless="false"
timeout="20"/>
....
....
....
</system.web

"Giles Papworth" wrote:

Thanks for that but it seems to have made no difference.

"Aris Houbavlis" wrote:

<configuration>
<system.web>
<pages buffer="true" ...
...
...
...
...
</system.web>
</configuration>
"Giles Papworth" wrote:

What section in the web.config does that go in?
>
"Aris Houbavlis" wrote:
>
Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />

Aris

"Giles Papworth" wrote:

Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.
>
"Aris Houbavlis" wrote:
>
Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.

Thanks,
Aris

"Giles Papworth" wrote:

I seem to be getting this error message all of a sudden on one of my web apps:
>
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60
>
[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102
>
[HttpException (0x80004005): Invalid_Viewstate
>
>
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?R2lsZXMgUGFwd29ydGg=?=]

<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424"
sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes"
cookieless="false" timeout="20"/>

"Aris Houbavlis" wrote:

what state server setting do u have?
InProc,
SqlServer,
StateServer,
Off (Disables session state)

<system.web>
<sessionState mode="StateServer"
stateConnectionString="tcpip=SampleStateServer:424 24"
cookieless="false"
timeout="20"/>
....
....
....
</system.web

"Giles Papworth" wrote:

Thanks for that but it seems to have made no difference.

"Aris Houbavlis" wrote:

<configuration>
<system.web>
<pages buffer="true" ...
...
...
...
...
</system.web>
</configuration>
>
>
"Giles Papworth" wrote:
>
What section in the web.config does that go in?

"Aris Houbavlis" wrote:

Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />
>
Aris
>
"Giles Papworth" wrote:
>
Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.

"Aris Houbavlis" wrote:

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.
>
Thanks,
Aris
>
"Giles Papworth" wrote:
>
I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate


And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?QXJpcyBIb3ViYXZsaXM=?=]

Hi Giles,
Any info in the event viewer?
Could be that the IIS is recycling, for some odd reason.
I would try to set session to STATESERVER.
Look here for ref:
http://msdn2.microsoft.com/en-us/lib...z9(vs.80).aspx
See if it resolves the Session problem u are experiencing.

Aris

"Giles Papworth" wrote:

<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424"
sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes"
cookieless="false" timeout="20"/>

"Aris Houbavlis" wrote:

what state server setting do u have?
InProc,
SqlServer,
StateServer,
Off (Disables session state)

<system.web>
<sessionState mode="StateServer"
stateConnectionString="tcpip=SampleStateServer:424 24"
cookieless="false"
timeout="20"/>
....
....
....
</system.web

"Giles Papworth" wrote:

Thanks for that but it seems to have made no difference.
>
"Aris Houbavlis" wrote:
>
<configuration>
<system.web>
<pages buffer="true" ...
...
...
...
...
</system.web>
</configuration>


"Giles Papworth" wrote:

What section in the web.config does that go in?
>
"Aris Houbavlis" wrote:
>
Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />

Aris

"Giles Papworth" wrote:

Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.
>
"Aris Houbavlis" wrote:
>
Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.

Thanks,
Aris

"Giles Papworth" wrote:

I seem to be getting this error message all of a sudden on one of my web apps:
>
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60
>
[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102
>
[HttpException (0x80004005): Invalid_Viewstate
>
>
And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?

[=?Utf-8?B?R2lsZXMgUGFwd29ydGg=?=]

I will add that in and see if it does the job.

"Aris Houbavlis" wrote:

Hi Giles,
Any info in the event viewer?
Could be that the IIS is recycling, for some odd reason.
I would try to set session to STATESERVER.
Look here for ref:
http://msdn2.microsoft.com/en-us/lib...z9(vs.80).aspx
See if it resolves the Session problem u are experiencing.

Aris

"Giles Papworth" wrote:

<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424"
sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes"
cookieless="false" timeout="20"/>

"Aris Houbavlis" wrote:

what state server setting do u have?
InProc,
SqlServer,
StateServer,
Off (Disables session state)
>
<system.web>
<sessionState mode="StateServer"
stateConnectionString="tcpip=SampleStateServer:424 24"
cookieless="false"
timeout="20"/>
....
....
....
</system.web
>
"Giles Papworth" wrote:
>
Thanks for that but it seems to have made no difference.

"Aris Houbavlis" wrote:

<configuration>
<system.web>
<pages buffer="true" ...
...
...
...
...
</system.web>
</configuration>
>
>
"Giles Papworth" wrote:
>
What section in the web.config does that go in?

"Aris Houbavlis" wrote:

Hi Giles,
Try adding this in your web.config
<pages buffer="true" enableSessionState="true" enableViewState="true"
enableViewStateMac="false" />
>
Aris
>
"Giles Papworth" wrote:
>
Also i have now changed my machine key and that seems to have resolved that
problem but now the session seems to be ending everytime i have posted data
to another page.

"Aris Houbavlis" wrote:

Hi Giles,
There are 2 things you need to make sure of.
1 . If these machines are part of a webfarm make sure all web.config
validationKey,
decryptionKey have the same value across all machines.
2. All objects you place in viewstate are serializable.
>
Thanks,
Aris
>
"Giles Papworth" wrote:
>
I seem to be getting this error message all of a sudden on one of my web apps:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this
is a cluster, edit <machineKeyconfiguration so all servers use the same
validationKey and validation algorithm. AutoGenerate cannot be used in a
cluster. 2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +117
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +102

[HttpException (0x80004005): Invalid_Viewstate


And it goes on to explain about the page. On one development machine this
works and then on mine this doesn't. Any ideas why this would suddenly start
happening?