Intrusion Prevention Blocked Office 365 Attachments

Hi,

We have had our new XG310 in for about a week now, it has mostly been going ok.

Just today though, outgoing attachments from Outlook all of a sudden stopped sending. (Stayed in Outbox)

I found that all of sudden, IPS was blocking traffic to Office 365.

I removed IPS from the firewall rule and that fixed it... but obviously not ideal.

See screenshots, any idea why this might have happened?

We had a similar scenario with our VoIP system, IPS just decided one day that the traffic was no good and blocked it!

Thanks,

Matt