Start with Logs: Why API Disconnects Often Trace Back to Token Expiry

Only one rule!!! Turn on logs and read them.

Remember the three trouble zones from authentication to response first.

Retail trader: "My API keeps disconnecting, where should I start?"

The first answer is logs, because troubleshooting is impossible without them.

Where to look when authentication fails

Check client id/secret

Verify token issuance succeeded

Confirm scope permissions match

Authentication failures usually come from one of three issues: key, time, or permission.

Auth token is the server issued access marker, and it has an expiry time.

How to check token renewal and expiry

Record token expiry time

Check for presence of refresh token

Confirm concurrent session limits

Token expiry is the most common cause of interruptions in automated trading.

What to check in the request stage

Match headers (content-type, signature)

Ensure body payload format is correct

Confirm endpoint URL accuracy

Signature verification is a signing method to ensure request integrity.

How response anomalies appear

Check HTTP status codes

Save original error codes and messages

Record response times (timeouts)

Distinguish HTTP 4xx/5xx first to separate client and server issues.

What to inspect for network and environment issues

Check firewall and proxy paths

Verify DNS and SSL certificate validity

Confirm time synchronization (NTP)

Callback URL is the address that receives external responses and must be publicly reachable.

What troubleshooting steps for automated trading

→ 1. Turn on log collection first, and capture failure times and payloads.

→ 2. Verify auth token validity and whether automatic renewal is implemented.

→ 3. Send sample requests with headers and signatures attached.

If that still fails, check the broker developer center API docs and error code tables,

and send error logs and request samples to customer support (developer inquiry).

So where to start

→ 1. Turn on logs: record failure times and full responses.

→ 2. Prioritize token validity: check if refresh logic exists.

→ 3. Reproduce the sample request: recreate the same request with curl.

Please use this as a reference only.

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※ Figures are as of the time of writing and may change.

※ If issues persist, consult the broker customer center or developer documentation.

※ This article is for information only and is not investment advice.