GCP IAM auth fails with Redis Cluster — LiteLLM sync path uses redis_connect_func which RedisCluster bootstrap ignores

What this error means

GCP IAM auth fails with Redis Cluster — sync path uses redis_connect_func which RedisCluster bootstrap ignores is a LiteLLM failure pattern reported for developers trying to fix gcp iam authentication failure when running litellm proxy with redis cluster — the sync auth path creates a standalone redis client via redis_connect_func that doesn’t participate in redis cluster topology. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub issue #28379 (May 21, 2026) on BerriAI/litellm, labeled ‘bug’ and ‘SDK’. Direct infrastructure compatibility error affecting production deployments combining GCP workload identity + Redis Cluster + LiteLLM proxy. High commercial value for enterprise cloud deployments.

Common causes

• GitHub issue #28379 (May 21, 2026) on BerriAI/litellm, labeled ‘bug’ and ‘SDK’. Direct infrastructure compatibility error affecting production deployments combining GCP workload identity + Redis Cluster + LiteLLM proxy. High commercial value for enterprise cloud deployments.

Quick fixes

1. Confirm the exact error signature matches GCP IAM auth fails with Redis Cluster — sync path uses redis_connect_func which RedisCluster bootstrap ignores.
2. Check the LiteLLM account, local tool state, and provider configuration involved in the failing workflow.
3. Verify the account session, API key, provider settings, and environment where the failing tool is running.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/BerriAI/litellm/issues/28379

Evidence note: GitHub issue #28379 (May 21, 2026) on BerriAI/litellm, labeled ‘bug’ and ‘SDK’. Direct infrastructure compatibility error affecting production deployments combining GCP workload identity + Redis Cluster + LiteLLM proxy. High commercial value for enterprise cloud deployments.

Related errors

• LiteLLM

FAQ

What should I check first?

Start with the exact GCP IAM auth fails with Redis Cluster — sync path uses redis_connect_func which RedisCluster bootstrap ignores text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed LiteLLM workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without GCP IAM auth fails with Redis Cluster — sync path uses redis_connect_func which RedisCluster bootstrap ignores.