API Returning 401 With Valid Bearer Token
When an API returns 401 Unauthorized despite a token that looks correct and unexpired, the issue is almost always in how the token is being sent or read, not...
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All troubleshooting articles, newest first.
Burp Suite Not Intercepting HTTPS Traffic
When Burp Suite intercepts plain HTTP traffic fine but HTTPS requests fail, hang, or simply never appear in the proxy history, it's almost always because the...
"Connection Reset" Testing API With Burp Proxy
A "connection reset" specifically while routing API requests through Burp usually means the TLS handshake between Burp and the target server is failing —...
CORS vs CSRF, What's the Actual Difference
CORS and CSRF get confused constantly because they both involve cross-origin requests and both show up in the same part of the stack — but they solve...
JWT Token Expired But Still Being Accepted
If a JWT with a clearly expired timestamp is still being accepted by your API, the token itself isn't the problem — your validation logic is either not...
MySQL Character Encoding Showing Question Marks
Question marks (or garbled characters like ’) appearing instead of accented letters, emoji, or other special characters almost always means there's a...
MySQL Deadlock Found When Trying to Get Lock
A deadlock in MySQL happens when two transactions each hold a lock the other one needs, and neither can proceed — MySQL detects this automatically and kills...
MySQL Slow Query Despite Having an Index
Having an index on a column doesn't guarantee MySQL will actually use it efficiently, or that using it will make a query fast — the query optimizer makes...
MySQL "Table Doesn't Exist" After Migration
Getting a "table doesn't exist" error right after running a migration that supposedly created that exact table almost always means the migration either didn't...