Template VMs can't update due to internet connection

I’m getting connection errors in template VMs when they try to update. These ones are not connected to the internet with a normal net-vm yet they are unable to both be updated via the Qubes Manager gui nor via sudo apt update or sudo apt install <pkg>.
These were the errors I got when trying to do a qubes-prompted update of one of my templates.

proxy: HTTP/1.0 500 Unable to connect  Server: tinyproxy/1.10.0  Content-Type: text/html  Connection: close     [IP: 127.0.0.1 8082]
                E: Failed to fetch https://deb.debian.org/debian-security/dists/bullseye-security/InRelease  Invalid response from proxy: HTTP/1.0 500 Unable to connect  Server: tinyproxy/1.10.0  Content-Type: text/html  Connection: close     [IP: 127.0.0.1 8082]
                E: Failed to fetch https://deb.qubes-os.org/r4.1/vm/dists/bullseye/InRelease  Invalid response from proxy: HTTP/1.0 500 Unable to connect  Server: tinyproxy/1.10.0  Content-Type: text/html  Connection: close     [IP: 127.0.0.1 8082]
                E: Some index files failed to download. They have been ignored, or old ones used instead.

What could be causing this?

A reboot helped, if anyone has a similar issue I’d start by trying that.

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