Salve,
L'errore postato in fondo mi compariva una volta ogni tanto ....mentre ora sempre!
Non capisco assolutamente da cosa puo dipendere.

Grazie


Server Error in '/' Application.
------------------------------------------------------------------------------

---

Unable to validate data.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Unable to validate data.
Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +196 System.Web.UI.LosFormatter.Deserialize(String input) +60

[HttpException (0x80004005): Authentication of viewstate failed. 1) If this is a cluster, edit <machineKey> configuration 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) +118 System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +102
[HttpException (0x80004005): Invalid_Viewstate
Client IP: 87.16.178.88
Port: 10154
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
ViewState:
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 Http-Referer: http://www.hdnservice.it/alto/InHotelMerci.aspx Path: /alto/InHotelMerci.aspx.]
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +443 System.Web.UI.Page.LoadPageViewState() +18
System.Web.UI.Page.ProcessRequestMain() +441



------------------------------------------------------------------------------

---

Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300

Daniele Bochicchio [MVP] [Staff] wrote:

anigrelli wrote:

Salve,
L'errore postato in fondo mi compariva una volta ogni tanto ....mentre ora sempre!
Non capisco assolutamente da cosa puo dipendere.


nella descrizione errore ci sono le 3 possibili cause.
se ti capita senza che sia tu a richiamare la pagina, può essere causato da un bot che richiama le pagine e fa post per motivi di spam.

Grazie per la risposta...
no l'errore viene in seguito a postback....
Documentandomi (.... kb831150, kb555353,kb 832183 e altro) ho visto che altri hanno avuto situazioni simili
e i problemi erano tutti sul server, per cui ho contatto l'hosting (ItHost) e Paparelli (Un altro grande!) mi ha
risposto che cerchera le cause...e nel frattempo mi ha dato una soluzione (che provero domani!) ovvero di
modificare il web.config e aggiungere la chiave <machineKey validationKey> con dei valori che mi a postato.
Non appena provato darò conferma della soluzione o meno del problema. Saluti