The input stream is not a valid binary format

I got the following exception

System.Runtime.Serialization.SerializationException: The input stream is not a valid binary format. The starting contents (in bytes) are: 53-79-73-74-65-6D-2E-57-65-62-2E-48-74-74-70-45-78 ... Server stack trace: at System.Runtime.Serialization.Formatters.Binary.SerializationHeaderRecord.Read(__BinaryParser input)... etc.

when I try to transfer a MarshalByValue object.
If I run remote server as executable (no host in IIS) I have no problem.

Scenario:

IIS 5.0, .Net 2.0
Remote object hosted in IIS
Client (WindowsForms)

Any suggest?

I post client/server config file.
----------------------

web.config

<system.runtime.remoting>
<application>
<channels>
<channel ref="http" useDefaultCredentials="false">
<serverProviders>
<formatter ref="binary" typeFilterLevel="Full" />
</serverProviders>
</channel>
</channels>
<service>
<wellknown
mode="Singleton"
type="xxx.yyy, xxx"
objectUri="ApplicationServer.rem" />
</service>
</application>
</system.runtime.remoting>

--------------------
client.config

<system.runtime.remoting>
<application>
<channels>
<channel ref="http" useDefaultCredentials="false">
<clientProviders>
<formatter ref="binary"/>
</clientProviders>
<serverProviders>
<formatter ref="binary" typeFilterLevel="Full"/>
</serverProviders>
</channel>
</channels>
</application>
</system.runtime.remoting>

.

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