uklans/cache-domains

MSFS 2020 doesn't cache

Closed this issue · 4 comments

askiiart commented

Describe the issue you are having

LanCache does not cache MSFS 2020 downloads, aside from the initial launcher download in Steam.

Describe your setup?

  • Downloading MSFS 2020 on Windows 10 IoT Enterprise LTSC, with IPv4 disabled (otherwise it does IPv6 lookups, bypassing the DNS overrides)
  • Running LanCache monolithic and DNS in Docker on another server.
  • LanCache DNS's upstream DNS is my OPNsense router, which then has Mullvad DoT DNS set as its upstream.

Are you running sniproxy

No.

DNS Configuration

DNS is set up via the LanCache DNS container.

Sniproxy output

N/A

More info

I was unable to intercept it with HTTP Toolkit because MSFS says the certificate is invalid, despite installing the certificate on the machine.

mintopia commented

Unfortunately MSFS fetches content from CDNs using TLS/HTTPS. This means Lancache is unable to cache it unfortunately.

askiiart commented

Unfortunately MSFS fetches content from CDNs using TLS/HTTPS. This means Lancache is unable to cache it unfortunately.

Ah alright, thank you.

askiiart commented

Just wondering: The download servers seem to have HSTS enabled, since it doesn't work with HTTP Toolkit's MITM-ing. But for theoretical non-HSTS HTTPS servers, if the cache had HTTPS with a self-signed cert, and I added that cert to the local machine, then wouldn't it be able to cache downloads from the theoretical non-HSTS HTTPS server?

mintopia commented

Yes, if you installed a certificate on your PC that would work - however it's not something we recommend or encourage.

In a LAN party environment, if I was asked to install a certificate on my PC by the organisers, I'd refuse to do it.

  • 👍1