[ERROR] [403]: Pls help me !

[Duongkhanhtool]

[11:11:52] ℹ️ [TOKEN] Antigravity refreshed
[11:11:52] ℹ️ [TOKEN] ANTIGRAVITY | refreshed
[11:11:52] ℹ️ [TOKEN_REFRESH] Credentials updated in localDb {"connectionId":"550c097a-6cf7-453b-9ab8-104d399068ca","success":true}
[ProjectId] Onboarding user with tier: standard-tier
[11:11:52] ℹ️ [TOKEN] Antigravity refreshed
[11:11:52] ℹ️ [TOKEN] ANTIGRAVITY | refreshed
[11:11:52] ℹ️ [TOKEN_REFRESH] Credentials updated in localDb {"connectionId":"ab1c51de-3256-4213-ba1e-01582ecbbd2c","success":true}
[ProjectId] onboardUser attempt 1 failed: onboardUser done but no project_id in response, retrying...
[11:11:52] ℹ️ [TOKEN] Antigravity refreshed
[11:11:52] ℹ️ [TOKEN] ANTIGRAVITY | refreshed
[11:11:52] ℹ️ [TOKEN_REFRESH] Credentials updated in localDb {"connectionId":"c73ac4c7-1ffe-4c66-a2a2-017f110fda62","success":true}
[11:11:53] [PENDING] END (ERROR) | provider=antigravity | model=claude-sonnet-4-6
[ERROR] [403]: ������RAN�0����V�m��SO �A�6E���Pe���:�e;���߱�S�".�)���x����������mlKD��;?9�u�����7�oA�Tk8��S����h�(�H� � �Y=�����O�N'I������^([-�̗�z��y6��T0e����(����Mz��l��0��ꄈ:��DI�d�F9��AՓ�-�c_-��n���yq�9�g}T%jL=j(����c� >d���Ԏ�o�0�T�Z���ƕ����纩��A�2��q��(6'��-�����t��v��@����w��a�zi0w�E����aP�ޜ�0��L�S��/�P6l�&�JC����b������4rO&������������i�P��1��;У���1�O\�Fm���B����
❌ antigravity [403]: [403]: ������RAN�0����V�m��SO �A�6E���Pe���:�e;���߱�S�".�)���x����������mlKD��;?9�u�����7�oA�T
Pls help me !

[qolbudr]

same issues here

[Duongkhanhtool]

[13:44:54] 📥 POST /api/v1/chat/completions | ag/gemini-3.1-pro-low | 1 msgs
[13:44:54] ℹ️ [ROUTING] ag/gemini-3.1-pro-low → antigravity/gemini-3.1-pro-low
[13:44:54] ℹ️ [AUTH] Using antigravity account: xxxxxxxxx@gmail.com
[ProjectId] Onboarding user with tier: standard-tier
[ProjectId] onboardUser attempt 1 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser attempt 2 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser attempt 3 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser attempt 4 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser failed after 5 attempts: onboardUser done but no project_id in response
[ProjectId] could not fetch projectId for connection e518d33d
[13:45:05] [PENDING] START | provider=antigravity | model=gemini-3.1-pro-low
[13:45:07] ℹ️ [TOKEN] Antigravity refreshed
[13:45:07] ℹ️ [TOKEN] ANTIGRAVITY | refreshed
[13:45:07] ℹ️ [TOKEN_REFRESH] Credentials updated in localDb {"connectionId":"e518d33d-3406-4da2-b10a-eeaeb354b111","success":true}
[13:45:09] [PENDING] END (ERROR) | provider=antigravity | model=gemini-3.1-pro-low
[ERROR] [403]: HTTP 403

[UNKNOWN052409]

its due to ban like antigravity banned acc

[Duongkhanhtool]

It's still the same Gmail account. It doesn't work on 9Router (403 error), but I can log in to Antigravity with it without any issues.

[Duongkhanhtool]

and work omnirouter

[DB] Driver: better-sqlite3 | file: C:\Users\Admin\AppData\Roaming\9router\db\data.sqlite
[AutoPing] scheduler started
[18:27:33] 📥 POST /api/v1/chat/completions | ag/gemini-3-flash-agent | 1 msgs
[18:27:33] ℹ️ [ROUTING] ag/gemini-3-flash-agent → antigravity/gemini-3-flash-agent
[18:27:33] ℹ️ [AUTH] Using antigravity account: chau@xxx.com
[ProjectId] Onboarding user with tier: standard-tier
[ProjectId] onboardUser attempt 1 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser attempt 2 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser attempt 3 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser attempt 4 failed: onboardUser done but no project_id in response, retrying...
[ProjectId] onboardUser failed after 5 attempts: onboardUser done but no project_id in response
[ProjectId] could not fetch projectId for connection 0acee12b
[18:27:44] [PENDING] START | provider=antigravity | model=gemini-3-flash-agent
[18:27:47] ℹ️ [TOKEN] Antigravity refreshed
[18:27:47] ℹ️ [TOKEN] ANTIGRAVITY | refreshed
[18:27:47] ℹ️ [TOKEN_REFRESH] Credentials updated in localDb {"connectionId":"0acee12b-80a7-46ce-9443-2e9c3583446a","success":true}
[18:27:48] [PENDING] END (ERROR) | provider=antigravity | model=gemini-3-flash-agent
[ERROR] [403]: HTTP 403
❌ antigravity [403]: [403]: HTTP 403

Omnirouter

[synd276]

same issue with this one:
#1059
no fix yet

[Duongkhanhtool]

same issue with this one: #1059 no fix yet

I'm using the same Gmail account. When I log in to AntiGravity, everything works normally. However, when I log in to 9Router, I get a 403 error. I also tried logging in to OmniRouter with the same account, and it works without any issues.

[karsontr13]

Aynı sorun bu sorunda da var: #1059 henüz çözüm bulunamadı.

Aynı Gmail hesabını kullanıyorum. AntiGravity'ye giriş yaptığımda her şey normal çalışıyor. Ancak 9Router'a giriş yaptığımda 403 hatası alıyorum. Aynı hesapla OmniRouter'a da giriş yapmayı denedim ve orada hiçbir sorun yok.

I'm experiencing the same problem. I've noticed that I don't have any issues using emails I created a long time ago, but I get 403 errors with accounts created more recently (maybe within this year).

[SahrulRamadhanHardiansyah]

Hi everyone! It looks like this is the exact same 403 API fingerprinting issue.

I did some reverse-engineering on the official Antigravity IDE and found that Google is blocking the requests because the system is sending outdated headers. I've submitted a fix for this in PR #2471.

Hopefully, it gets reviewed and merged soon! You can track the progress over there.

[claytontavaresdan]

Solution for [ERROR] [403]

Quick Fix

# Verify API key is valid
curl -H "Authorization: Bearer $API_KEY" http://localhost:20128/v1/models

# If invalid, regenerate key
# Dashboard → API Keys → Create New Key

Common Causes

1. Invalid API Key

   • Check if key is correctly set in .env
   • Regenerate key if needed

2. Expired Tokens

   • Clear token cache
   • Re-authenticate providers

3. Rate Limiting

   • Check usage: curl http://localhost:20128/api/usage
   • Wait for rate limit window to reset

4. Provider Issues

   • Verify provider status in dashboard
   • Check provider-specific errors

Debugging Steps

# Check logs
tail -100 ~/.9router/logs/9router.log | grep -i 403

# Verify configuration
cat .env | grep API_KEY

# Test connectivity
curl -v http://localhost:20128/v1/models

Prevention

• Use environment variables for API keys
• Monitor usage to avoid rate limits
• Regularly rotate API keys

Let me know the specific provider causing the 403 error!