20-04-2026 03:48 PM
I've hosted a football guessing website for a number of years on a dedicated server in my house (just for my friends for some fun). I've had no problems until a few weeks ago when I renewed my contract with EE broadband.
Now, I am getting weird intermitting problems with some of the guys trying to connect to my website. When they're on their home internet (different providers), they get a "Site cannot be reached ERR_TIMED_OUT" error - but when they drop off wifi and go on mobile internet, it magically just works. To add, sometimes when I restart the router it suddenly works for a while then stops working again.
I've got a dynamic DNS set on my router so I know it's not a problem with routing. It just, for some reason is not responding while on their home WIFI. Also, it's not all users - some can access fine both on home WIFI and mobile. It only seems to be https traffic affected, coming through on http fine all of the time. My certs are valid, my port forwarding hasn't changed for years so I know all that is setup fine.
I've done a full factory reset of the router, I've temporarily hosted the site on a different machine on the network. I'm all out of ideas. Anyone had any similar experience?
Solved! See the answer below or view the solution in context.
20-06-2026 12:24 PM
@rlyness wrote:From my server, now that I set the MTU to 1452, i get a frag at 1425
Yep, that's expected. 1424 bytes + 20 bytes (IP header) + 8 bytes (ICMP header) = 1452.
So anything north of 1424 would fragment.