Several factors, including incorrect credentials, browser-related issues, account security settings, or network problems can cause trouble signing in to Gmail. The steps below cover common fixes and more advanced troubleshooting methods to help restore access to your account safely and efficiently.

1. Confirm Your Internet Connection

1. Verify that your device is connected to a stable internet connection.
2. Open another website to confirm internet access is working properly.
3. If possible, switch to a different network and try signing in again.

2. Verify Your Email Address and Password

1. Confirm that your Gmail address is entered correctly.
2. Make sure Caps Lock is turned off.
3. Remove any accidental spaces before or after your email address or password.
4. Re-enter your password carefully and try again.

3. Reset Your Password if Necessary

1. Select Forgot password? on the Gmail sign-in page.
2. Follow the account recovery prompts.
3. Verify your identity using your recovery email address or phone number.
4. Create a new, strong password when prompted.

4. Try Another Browser or Device

1. Use a supported browser such as Chrome, Firefox, Safari, or Edge.
2. Attempt to sign in from another computer, smartphone, or tablet.
3. Determine whether the issue occurs only on one device or browser.

5. Clear Browser Cache and Cookies

1. Open your browser settings.
2. Clear cache, cookies, and site data.
3. Restart the browser.
4. Attempt to sign in again.

Note: Clearing cookies will sign you out of other websites.

6. Temporarily Disable Browser Extensions

1. Disable extensions such as VPN extensions, ad blockers, and password managers.
2. Test Gmail sign-in again.
3. Re-enable extensions one at a time to identify any conflicts.

7. Verify 2-Step Verification Access

1. Confirm that you have access to your phone, authenticator app, security key, or other verification method.
2. Use backup codes if your primary verification method is unavailable.
3. Verify that your recovery options are current and accessible.

8. Check Google's Service Status

1. Visit the Google Workspace Status Dashboard.
2. Check for reported Gmail or Google Account service outages.
3. Wait for Google to resolve any active service disruptions before attempting additional troubleshooting.

The following steps are intended for experienced users or IT administrators. Proceed only if the standard troubleshooting steps have not resolved the issue.

Check Network Connectivity and Authentication

Verify that your system can correctly resolve and connect to Google's authentication services.

DNS Lookup

nslookup accounts.google.com

or

dig accounts.google.com

SSL Certificate Verification

openssl s_client -connect accounts.google.com:443 -servername accounts.google.com

If DNS resolution or SSL validation fails, network or security software may be preventing access to Google services.

Review Local Network and Browser Configuration

1. Flush your DNS cache:

   Windows

   ipconfig /flushdns

   macOS

   sudo dscacheutil -flushcache
   sudo killall -HUP mDNSResponder

   Linux

   sudo systemd-resolve --flush-caches

2. Open your browser's Developer Tools and review the Network tab while attempting to sign in.
3. Check for errors such as:
   • 401 Unauthorized
   • 403 Forbidden
   • CORS-related errors
   • Failed network requests
4. Review the hosts file for entries that may block Google services:
   • Windows: C:\Windows\System32\drivers\etc\hosts
   • macOS/Linux: /etc/hosts
5. Temporarily disable VPNs, proxies, or firewall inspection features that may interfere with authentication.
6. Test the connection using a different network or mobile hotspot.
7. Verify that your device is configured to use automatic date and time synchronization.

Review Google Account Security Settings

1. Open your Google Account security settings.
2. Review recent account activity.
3. Remove unrecognized third-party applications.
4. Verify that your recovery email address and phone number are current.

Gmail Mobile App Troubleshooting

Android Devices

1. Clear the Gmail app data and cache.
2. Clear Google Play Services data if necessary.
3. Restart the device.
4. Open Gmail and test sign-in again.

iPhone and iPad (iOS)

1. Remove the Google account from Mail settings.
2. Restart the device.
3. Re-add the Google account.
4. Test sign-in functionality.

• Never share your password, verification codes, or backup codes with anyone.
• Use only official Google websites for account recovery, such as gmail.com and accounts.google.com.
• Avoid changing passwords while connected to public Wi-Fi whenever possible.
• Work or school Gmail accounts may have administrator-imposed restrictions that limit available recovery options.
• Re-enable any extensions, VPNs, or security software after troubleshooting is complete.