When users attempt to log on to the Web Client, either of the following errors may be logged to the Diagnostics Console.
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Input stream is not a valid binary format.
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<title>Could not load file or assembly ‘System.Web.Extensions'...</title>
The first error is displayed if the Web Server is using remoting as its ServiceClientType. The second error is displayed if the Web Server is using SOAP.
On the login page, the following error is displayed:
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The server encountered an error when logging in. If this problem persists, you should contact your administrator for resolution.
Similar errors are captured when users attempt to access the service.asmx page of the Application Server.
This issue may occur for several reasons.