This is a hidden but common cause. If your PC’s date/time is incorrect (especially year off by more than a few minutes), SSL certificates used by Unlock Tool’s server will be rejected, resulting in a timeout.
This is the most common cause, but also the easiest to fix.
Fix: Reset your password via the tool’s official website. Never use "universal" passwords across multiple unlocking services.
Most unlock tools offer no refunds for authentication errors, as they are local or network issues. However, support can extend your subscription time if their server was down.