weird wifi issue - slow card payments

Are you using the Starlink modem's WiFi? If so then you may be double-NAT ing. Maybe put the Starlink modem in bridge mode, which disables the built in WiFi.
 
Are you using the Starlink modem's WiFi? If so then you may be double-NAT ing. Maybe put the Starlink modem in bridge mode, which disables the built in WiFi.
Agree...we always put in our gateway...and bridge the CPE. Allows us to manage things better for the client. Gives us control of your network, which, if the client wants our help, we need to have.
I've seen quite a few discussions re: MTU with starlink, on sites like reddit with some decent techs that ran into quirks and adjusted that.
Typically it's managed at the gateway, where it's done at the edge, I haven't tried stand alone APs but I "think" you can do it on the Unifi APs.
 
Are you using the Starlink modem's WiFi? If so then you may be double-NAT ing. Maybe put the Starlink modem in bridge mode, which disables the built in WiFi.
the starlink router is the only router on site, if I put it in bridge mode as @YeOldeStonecat says it will need another router installing.

I assume with the correct login credentials I will be able to login and disable the wifi, but I wouldn't want to put it in bridge mode.

why would anyone be double Nat'ed ?
the starlink router is handling DHCP on the lan, the Unifi APs are just handling wifi access
 
I recommend trying the PingPlotter with pings to 8.8.8.8 if you don't know the IP/hostname of the CC server (would have to either get from the company or by using a packet sniffer like wireshark or built into a firewall) as well as one to the head of the network. You need to see whether there's any difference between them. Do this with a laptop plugged into a jack where you can plug in a CC machine. If there isn't, and you're not dropping to 8.8.8.8, plug the machine into the same jack and test the CC a bunch of times. If the laptop seems great the entire time and the CC machine has random issues, it might be a coincidence that the change happened after you made changes and it's really the CC company's end. You could also try connecting the CC machines to a separate network somewhere else if possible (it sounds like this would be difficult, though).

+1 for bridging the starlink and using your own router/firewall at the head of the network. 1500 MTU is standard for nearly any regular network device so you shouldn't have to worry about MTU issues if starlink is already using standard 1500 MTU.
 
So to put this one to bed.

I went back and unplugged everything, moved the starlink router back to where it was originally and put everything back on wifi.
Went back the next day and the customer confirmed that this had no effect.

So now the "unifi network" has been reinstated, assuming that the customer wasn't trying to pull a fast one ( i have no reason to believe that they were) it is very odd how the issue started straight after the unifi APs were made "live"
 
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