@TELUS_Support
I’ve been experiencing intermittent HTTP/HTTPS connectivity issues for about a month, primarily in the late evenings. Approximately 80-100% of TCP connections (ports 80 and 443) fail during these periods, rendering the internet nearly unusable. Wireshark captures show a Telus-owned IP (209.121.229.0 or 209.121.229.128) responding with ICMP "Destination Unreachable (Communication Administratively Filtered)" errors. Additionally, the T3200 router’s built-in speed test (using Telus servers) fails during these times, ruling out customer-owned equipment as the cause.
Interestingly, using a WireGuard VPN restores full connectivity when the VPN successfully connects, suggesting a misconfiguration in Telus’s network, possibly on a load-balanced server that rejects connections during high-traffic periods. Another Telus user reported similar issues recently: forum.telus.com/t5/Internet-Home-Phone/internet-fail-suddenly-and-sporadically/td-p/167582.
Troubleshooting Steps Completed:
Single PC connected via Ethernet to T3200 router.
Tested with different Ethernet cables.
Power cycled ONT and router.
Factory reset T3200 router.
Tested with a different router.
Tested multiple devices (PCs, phones) via Wi-Fi and Ethernet—issue persists across all.
Confirmed MTU is 1472 (normal for PPPoE).
Ping, nslookup, and traceroute work fine, but TCP connections fail.
Attached is a Wireshark capture showing TCP and ICMP traffic during a failure, highlighting the ICMP errors from 209.121.229.x. and a screenshot of the T3200 router's internal speedtest failing.
Please investigate potential firewall, proxy, or routing misconfigurations on Telus’s network, particularly for the IP 209.121.229.0/209.121.229.128. I’m happy to provide further details or assist with diagnostics. Thank you!
