404 – File or Directory not found, BizTalk WCF calls to service

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Quite recently we encountered an error in BizTalk WCF sends when the message being sent over the wire.

The error being reported on BizTalk and event viewers is more of a generic error like:

Size Issue

We noticed that the error happened wheever the message being sent is big in size say 100 MB- 150 MB.

So to check if this was infact the issue, we increased the maxRequestLength=”2147483647″ which did not help.

For IIS 7 and above there are more settings to be modified for this to work, there needs to be a security settings in the config that allows the service to accept bigger messages.

<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength=”1048576000″/> <!– 1000 MB –>
</requestFiltering>
</security>
</system.webServer>

The setting can be applied at the IIS level as well and that would then apply to all the services hosted on the IIS server.

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