Unable to Upload Large Files — Uploads Randomly Fail

Hello,

I am consistently experiencing failed uploads when pushing Docker images(other upload usecases too) to GHCR from my Xfinity connection. The uploads start but terminate partway through with Broken pipe

This happens with both large and smaller pushes. The same operation succeeds instantly when tethered through a mobile hotspot or non-Xfinity network.

I have already tried the following without success:

• Multiple systems (macOS and Linux)

• Xfinity modems (including XB8)

• Restarting modem/router

• Flushing DNS and changing DNS to Google (8.8.8.8)

My trials suggest a possible upstream shaping or packet issue similar to what other users have documented here:
🔗 Large SCP transfers blocked (Xfinity Community)
🔗 Inability to upload any file (Xfinity Community)

Could a network engineer please verify:

• Whether there is current traffic shaping or firewall policy affecting outbound SSH/HTTPS streams?

• Whether my assigned IP range is subject to any upload restrictions?

• Upstream signal levels or packet loss logs during sustained uploads?