Hi
I have Draytek router;
Model Name : Vigor2820
Firmware Version : 3.3.7.3_232201

It is working fine. I set it up about one and half years ago and since we had no problem.
But some reason last two weeks, I can upload and download images on any computers in my office.
I have 15 computers and they all access internet through this router. I haven't update or alter router for some time.
I don't know why suddently it start behaving like this.
Where I look it up in router, where it is blocking images.

Please can someone advice.

Many thanks
Ish