I've no idea. On the Xenforo forums they think it is to do with the security on the host blocking the connection. The host has supposedly edited a setting but maybe that was a setting for the search that was blocked and not the notifications. The support tech didn't seem that clued into what I was telling them, to be honest.
I don't know if anyone else gets this issue, but after a few Oops messages, I can no longer connect to the site for an hour or so, even with another browser. 37 minutes this time. Well it would have been 37 minutes if I could have posted this post, but that just went as well? I get timed out.