Error Autopsy | Debugly

Error Autopsy

EPIPE Broken Pipe on a Write That Was Perfectly Legal

The crash report said write EPIPE. The stack trace pointed at a line of code that was, by every reading, correct. It was writing the response to an open request. Writing to an open request is the entire job of a server. Except the request was not open anymore. The

Error Autopsy

SSL routines wrong version number, and the Port That Was Never 443

The error looks like a certificate problem. It is almost never a certificate problem. error:1408F10B:SSL routines:ssl3_get_record:wrong version number Or, depending on which client you are using: curl: (35) error:1408F10B:SSL routines:ssl3_get_record:wrong version number OpenSSL SSL_connect: SSL_ERROR_SYSCALL

Security

JWT Expired: When the Token Is Fine and the Clock Is Not

Tokens rejected as expired seconds after issue, or accepted long after they should have died. Both are the same bug seen from opposite ends.

Networking

You Fixed CORS and the Browser Kept Failing for Another Ten Minutes

Access-Control-Max-Age caches the preflight decision, including the one that said no. Here is why your fix looked like it did not work.

MicroVMs

The CORS Header Is Present Twice and That Is Why It Fails

You added the header at the proxy, your framework was already sending it, and the browser now rejects both. Duplicates are invalid, not additive.

MicroVMs

413 Request Entity Too Large When You Already Raised the Limit

You raised the body size limit and the upload still fails. There are almost always two limits, and the one you changed is rarely the one rejecting you.

Networking

TLS Handshake Failures: Reading the Error the Server Actually Sent

handshake failure, protocol version, unknown ca and bad certificate all mean different things. Here is how to get the real reason out of a connection that dies in the first two packets.

MicroVMs

The Domain Resolved Everywhere Except Where I Was Sitting

A CNAME that dig confirmed, a browser that refused, and a certificate stuck on pending. Three separate caches pretending to be one problem.

DevOps

Your systemd Service Will Not Start and the Logs Say Nothing Useful

status=203/EXEC, status=217/USER, and the other exit codes that mean something specific. Here is how to read them and what each one actually points at.

Networking

Cloudflare Error 526 and the Redirect Loop: Two Failures, One Setting

Flexible gives you an infinite redirect. Full strict gives you a 526. The documentation says Full or higher, and higher is the one that breaks.

Node.js

EMFILE: Too Many Open Files, and Why Raising the Limit Is Usually Wrong

The quick fix is raising ulimit. The real question is what is holding thousands of descriptors open and never closing them.

Shopify

Shopify Webhooks You Are Not Receiving

The webhook is registered, orders are being created, and nothing arrives. Here is where they go and how to stop being unsubscribed.

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