OK this looks like a timeout whilst you were collecting your email using MS Outlook, is that correct? - If so you can extend the timeout delay from within Outlook, sorry I'm not an Outlook user (OE) so I'm not familiar how to do this in outlook. You may also need to extend the delay in avast also (but probably not), this can be done in the avast Outlook/Exchange plug-in, Customize, Advanced Tab.
This can happen if you have either a lot of email or some with large attachments, they need to be scanned and occasionaly the time taken to do that exceeds the timeout delay.