topic Routing failure on BT/EE Backbone blocking access to Render.com / Cloudflare in Broadband & Landline

Routing failure on BT/EE Backbone blocking access to Render.com / Cloudflare

tomble — Tue, 09 Jun 2026 15:40:12 GMT

Hi everyone,

I am experiencing a severe routing issue on my EE Home Broadband connection that is intermittently (sometimes totally) blocking access to dashboard.render.com (and associated hosted applications).

As a SaaS business owner who hosts my infrastructure on Render, this routing failure has entirely broken my development workflow and access to my live platform. I have just lost a full business day troubleshooting this infrastructure issue instead of driving actual value for my business, which has been incredibly frustrating.

I have performed extensive differential testing and isolated the issue entirely to the EE/BT core routing network.

The Problem

Any TCP connection over Port 443 (HTTPS) to Render's IP block (216.24.57.x) times out completely on EE Home Broadband.

Diagnostics & Cross-Carrier Testing

EE Home Broadband: 100% failure rate. Test-NetConnection on port 443 fails with a TCP timeout.
EE Mobile Hotspot: Degraded/Intermittent. It resolves via a NAT64 gateway (64:ff9b::), fails on the primary target, but occasionally succeeds on a fallback IP.
Vodafone Mobile Hotspot: 100% success rate. Instantly connects to the destination on port 443.
Local Settings: I have completely turned off EE Web Protection, Content Lock, and Parental Controls. This is not a local firewall or software block.

Traceroute Evidence (The Smoking Gun)

A tracert from my EE Home Broadband connection shows that traffic traverses the BT core network perfectly fine until it hits the Global Internet Access (GIA) edge network, where it dies immediately at hop 8 (166-49-135-83.gia.bt.net). It never leaves the BT network to be handed off to the destination:

Plaintext

Tracing route to gcp-us-west1-1.origin.onrender.com.cdn.cloudflare.net [216.24.57.7]
over a maximum of 30 hops:

  1     1 ms     1 ms     1 ms  ************
  2     4 ms     3 ms     4 ms  ************
  3     *        *        *     Request timed out.
  4     *        6 ms     *     62.172.102.140
  5     6 ms    14 ms     6 ms  peer7-et-3-0-3.telehouse.ukcore.bt.net [62.6.201.226]
  6     7 ms     7 ms     6 ms  transit1-xe-000.telehouse.ukcore.bt.net [194.72.16.177]
  7     6 ms     6 ms     7 ms  166-49-214-166.gia.bt.net [166.49.214.166]
  8     9 ms     8 ms     8 ms  166-49-135-83.gia.bt.net [166.49.135.83]
  9     *        *        *     Request timed out.
 10     *        *        *     Request timed out.
[...times out continuously up to 30 hops...]

Next Steps

Because this is happening deep within the gia.bt.net transit layer, this appears to be a broken BGP route or an issue at a major peering exchange point between BT/EE and Cloudflare/Render's upstream network.

Could a forum moderator please escalate this traceroute directly to the Tier 2/Tier 3 Network Engineering/NOC teams? Standard customer service handles cannot resolve backbone routing table issues.

I suspect this affects many other internet services hosted on that IP range that Cloudflare/Render uses.

Thank you.

[Mod edit: Personal details redacted. Please do not share personal details as your posts are visible to the public. Thanks!]

Re: Routing failure on BT/EE Backbone blocking access to Render.com / Cloudflare

XRaySpeX — Tue, 09 Jun 2026 15:55:05 GMT

It traces fine here over EE FF150 (the Blank Bullet):

16:44:50.34 C:\>tracert http://dashboard.render.com/
Unable to resolve target system name http://dashboard.render.com/.
16:45:19.30 C:\>tracert dashboard.render.com
Tracing route to gcp-us-west1-1.origin.onrender.com.cdn.cloudflare.net [216.24.57.251]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms OrangeRouter2 [192.168.1.2]
2 2 ms 2 ms 2 ms 172.16.14.26
3 * * * Request timed out.
4 4 ms 3 ms 3 ms 62.172.102.78
5 4 ms 4 ms 4 ms 213.121.193.153
6 4 ms 4 ms 4 ms transit1-xe-0-0-1.telehouse.ukcore.bt.net [194.72.16.179]
7 5 ms 4 ms 4 ms 166-49-214-192.gia.bt.net [166.49.214.192]
8 7 ms 5 ms 5 ms t2c3-et-8-3-0.uk-lof.gia.bt.net [166.49.195.182]
9 5 ms 5 ms 5 ms t2c4-et-3-0-5-1.uk-lof.gia.bt.net [166.49.250.59]
10 6 ms 6 ms 5 ms linx-lon1.as13335.net [195.66.225.179]
11 6 ms 6 ms 6 ms 141.101.71.1
12 5 ms 5 ms 5 ms 141.101.71.133
13 5 ms 5 ms 5 ms 216.24.57.251
Trace complete.

What is the name of the EE BB plan you are on including its speed? Which EE router & WiFi extenders, if any, do you have (read label or post a pix)?

Re: Routing failure on BT/EE Backbone blocking access to Render.com / Cloudflare

XRaySpeX — Tue, 09 Jun 2026 16:00:33 GMT

This user discussion group is not the correct platform for formally escalating issues & requiring their fix in EE systems. You need to report your issues to CS. Failing any progress that way you could raise a complaint.

Re: Routing failure on BT/EE Backbone blocking access to Render.com / Cloudflare

JimM11 — Tue, 09 Jun 2026 16:08:50 GMT

@tomble Good on the vodafone broadband network also.

|------------------------------------------------------------------------------------------|
| WinMTR statistics |
| Host - % | Sent | Recv | Best | Avrg | Wrst | Last |
|------------------------------------------------|------|------|------|------|------|------|
| ZenWiFi_XT8-BBD0 - 0 | 61 | 61 | 1 | 1 | 3 | 1 |
| 90.247.128.1 - 0 | 61 | 61 | 4 | 163 | 326 | 155 |
| 63.130.172.35 - 58 | 19 | 8 | 11 | 12 | 14 | 11 |
| 90.255.251.37 - 0 | 61 | 61 | 12 | 14 | 30 | 12 |
| 162.158.32.45 - 0 | 61 | 61 | 11 | 15 | 78 | 13 |
| 216.24.57.251 - 0 | 61 | 61 | 11 | 12 | 18 | 12 |
|________________________________________________|______|______|______|______|______|______|
WinMTR v0.92 GPL V2 by Appnor MSP - Fully Managed Hosting & Cloud Provider