Fixing App Login Errors, Step 1 Troubleshoot Solves 70%, How?

App login error? Stay calm first.

I provide three essential checks before reinstalling the app.

Retail investor:

"I keep getting authentication failed when I log in, what should I do?"

First, confirm internet works in a browser or another app, since this is the most commonly missed step.

Which comes first, Step 1 or Step 2?

Step 1: Basic checks → Verify Wi‑Fi/carrier, app version, and automatic time sync

Step 2: Account and authentication checks → Reenter ID/password, verify authentication methods (certificate, OTP)

Start with basic checks and if that fails, move to account and authentication verification.

Certificate → This is an electronic signature file for identity verification, and copying, renewal, and the password are key.

Why does authentication keep failing?

Outdated app versions may prevent security modules from running.

Phone time drift can fail certificate validity checks.

Three consecutive wrong certificate password attempts can lock the certificate.

Step 1: Basic troubleshooting steps

→ 1. Network check: Confirm either mobile data or Wi‑Fi is connected

→ 2. App update: Update to the latest version from the app store

→ 3. Time settings: Enable automatic time (network time) in settings

These three steps solve 70% of cases.

Step 2: Specific fixes for account and authentication

→ 1. Reenter ID/password: Delete keyboard autocomplete and type manually

→ 2. Check certificate location: Verify the certificate exists on your smartphone or PC and its path

→ 3. Re-register OTP/simple authentication: Reset the authentication method and try re-registering

If still unresolved, contact customer service or get reissued from the certificate issuer.

Notes on certificates and OTP

Transferring certificate → Copy the file when moving from PC to smartphone.

OTP app reset → Identity verification procedures vary by brokerage, so follow customer service guidance.

So, what to do first

→ 1. Today’s tasks: Toggle Wi‑Fi off and on, and check app updates once

→ 2. Next tasks: If you cannot remember certificate password, prepare for reissue (ID and account details)

→ 3. Final check: Send screenshots of the symptoms and error screens to your brokerage customer service

Confirm final procedures with your brokerage customer service or certificate issuer.

For reference only.

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

※ Investment decisions and responsibility rest with the investor.

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

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