ActionDispatch::RemoteIp::IpSpoofAttackError: IP spoofing attack?! HTTP_CLIENT_IP="88.97.215.78" HTTP_X_FORWARDED_FOR="109.207.140.157" (ActionDispatch::RemoteIp::IpSpoofAttackError)

## Error

```
IP spoofing attack?! HTTP_CLIENT_IP="88.97.215.78" HTTP_X_FORWARDED_FOR="109.207.140.157" (ActionDispatch::RemoteIp::IpSpoofAttackError)
```

## Stack trace

```
action_dispatch/middleware/remote_ip.rb:147 in calculate_ip
action_dispatch/middleware/remote_ip.rb:168 in to_s
action_dispatch/http/request.rb:307 in remote_ip
app/controllers/application_controller.rb:181 in set_request_context
active_support/callbacks.rb:403 in block in ActiveSupport::Callbacks::CallTemplate::MethodCall#make_lambda
active_support/callbacks.rb:202 in block (2 levels) in ActiveSupport::Callbacks::Filters::Before.halting
abstract_controller/callbacks.rb:34 in block (2 levels) in
active_support/callbacks.rb:203 in block in ActiveSupport::Callbacks::Filters::Before.halting
active_support/callbacks.rb:598 in block in ActiveSupport::Callbacks::CallbackSequence#invoke_before
active_support/callbacks.rb:598 in each
```

## Tracking Details
- **Project**: exercism-rails
- **Sentry**: [ActionDispatch::RemoteIp::IpSpoofAttackError: IP spoofing attack?! HTTP_CLIENT_IP="88.97.215.78" HTTP_X_FORWARDED_FOR="109.207.140.157" (ActionDispatch::RemoteIp::IpSpoofAttackError)](https://thalamus-ai.sentry.io/issues/97471193/)
- **Culprit**: Auth::SessionsController#new
- **First seen:** Feb 18, 2026