Ouch! 500 Error

[Anonymous]

We have seen "500" error with the following error message while querying getMultipleLeads() 

<h1>Ouch! 500 Error</h1>

    <img src=""http://app.marketo.com/images/icons128/band_aid.png""/>

      Something went wrong.<br />

    <br/>We monitor this sort of thing,<br/> but if you are an authorized support contact <br/>you should <a href=""http://marketo.com/support"">create a support ticket</a>.<br/>

    <br/>We will figure it out together.<br/>

How to identify the cause? We ran into similar error twice in the past too.

Is this some problem with Marketo service? We saw this error yesterdat(10th September)

[Anonymous]

500 Errror means it is a server errror.It's hard to say without seeing what the request is. Can you post your request XML here?

[Anonymous]

Unfortunately we haven't logged the requests while running the task. Around 140k results we fetched before this error has occured.

Do you think incorrect request could cause this? Usually Marketo handles incorrect requests gracefully with 500 error but with a proper SOAP fault string. But in this case a html response is returned.