Gemini CLI auth blocked due to IP-level rate limiting from excessive concurrent sessions

[the3mi]

Description

When attempting to authenticate via gemini auth on a Raspberry Pi,
the CLI returned a Google HTML error page stating:

"your computer or network may be sending automated queries"

The web browser was able to log into Gmail successfully with the same
account, confirming the Google account itself is not blocked.
The issue is at the IP level.

https://discord.com/channels/1491295327620169908/1493223588088512542

Steps to Reproduce

1. Open 10+ concurrent Gemini CLI sessions on the same device
2. Hit the daily rate limit
3. Attempt to run gemini auth again
4. Authentication fails with Google's automated query block page

Expected Behavior

gemini auth should either:

• Succeed normally, or
• Return a clear rate limit error message (e.g. HTTP 429)
  instead of an opaque Google HTML block page

Environment

• Device: Raspberry Pi
• Auth method: OAuth (personal Google account)
• No VPN
• Router reboot did not resolve the issue

Screenshots / Logs

Failed to sign in. Message: ...

...but your computer or network
may be sending automated queries. To protect our users, we can't process
your request right now.

...