Kubernetes / Cloud Platforms

Kong Ingress Controller serves partial HTTP2 content on large requests TCP ZeroWindow deadlock

Fix large file proxy failures above 100KB returning partial content instead of full response in Kong Kubernetes deployments Includes evidence for Kubernetes troubleshooting demand.

Source-backed Last updated May 23, 2026 1 source Needs local verification

Category: Cloud Platforms
Error signature: net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag
Quick fix: Check the build output, project root, and deployment platform configuration before redeploying.
Updated: May 23, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Kubernetes, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag is a Kubernetes failure pattern reported for developers trying to fix large file proxy failures above 100kb returning partial content instead of full response in kong kubernetes deployments. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub issue #7933 shows production issue where Kong proxy receives large files but stops forwarding them TCP receive buffer gets stuck, ZeroWindow sent upstream, connection deadlocks. Affects enterprise Kubernetes deployments using Kong ingress controller. Category mapping Kubernetesingress context to Cloud Platforms per approved category table.

Common causes

GitHub issue #7933 shows production issue where Kong proxy receives large files but stops forwarding them TCP receive buffer gets stuck, ZeroWindow sent upstream, connection deadlocks. Affects enterprise Kubernetes deployments using Kong ingress controller. Category mapping Kubernetesingress context to Cloud Platforms per approved category table.

Quick fixes

Confirm the exact error signature matches net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag.
Check the Kubernetes account, local tool state, and provider configuration involved in the failing workflow.
Check the build output, project root, and deployment platform configuration before redeploying.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag exactly before applying the quick fix.
Compare the failing environment with Kubernetes versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag mean in Kubernetes?

net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag indicates the workflow described by "Kong Ingress Controller serves partial HTTP2 content on large requests TCP ZeroWindow deadlock" failed in a Cloud Platforms context. Start by confirming the exact signature and the component that emitted it.

What should I check first for net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag?

Check whether this cause matches your environment: GitHub issue #7933 shows production issue where Kong proxy receives large files but stops forwarding them TCP receive buffer gets stuck, ZeroWindow sent upstream, connection deadlocks. Affects enterprise Kubernetes deployments using Kong ingress controller. Category mapping Kubernetesingress context to Cloud Platforms per approved category table.

Is the net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag guidance source-backed?

The "Kong Ingress Controller serves partial HTTP2 content on large requests TCP ZeroWindow deadlock" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag?

For "Kong Ingress Controller serves partial HTTP2 content on large requests TCP ZeroWindow deadlock", avoid applying "Check the build output, project root, and deployment platform configuration before redeploying." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging net::ERR_HTTP2_PROTOCOL_ERROR 206 Partial Content; recv buffer stuck with ZeroWindow flag?

For "Kong Ingress Controller serves partial HTTP2 content on large requests TCP ZeroWindow deadlock", collect the failing Kubernetes command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.