Can't use Crunchyroll via WireGuard

Hi,

not sure where else to post this. For a while now, I've unsuccessfully been trying to get WireGuard to work with Crunchyroll.

Setup is as follows:

• dedicated server hosts a wg-quick instance in [neighboring country]
• OPNSense acts as peer on a single IP
• I have a rule for routing the entire traffic of some source device via that IP

This works just fine. Handshake successful, traffic is routed via the server. traceroute shows the server as the hop immediately after my device's local gateway. The connection is stable, and fast.

...except for Crunchyroll. The site / app itself is fine, but I can not, for the life of me, get a video to play. It just keeps loading forever.

I don't think this is an issue with CR recognizing that I'm not where I say I am - looking online, it seems pretty easy to use CR with a VPN. I've also tried from multiple other devices, all with the same symptom.

If anyone has suggestions, I'd love to hear them 😅

EDIT: It was MTU. Had to manually set it to 1500 on both devices.

Nope, still the same issues. I was using the fallback interface there briefly.

EDIT: It WAS MTU related, I had to enable MSS clamping on the OPNSense.