We have seen "500" error with the following error message while querying getMultipleLeads()
<h1>Ouch! 500 Error</h1>
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)