Hospital
Verified debugging solutions for Azure OpenAI, Semantic Kernel, and .NET AI errors. Root cause analysis and tested fixes — sourced from real production incidents.
Azure OpenAI Content Filter Error: C# Fix
Fix Azure OpenAI content_filter errors in C#. Decode 400 responses, adjust prompts and policies, and catch streaming filter failures.
Fix Azure OpenAI Structured Output 400 Errors in C# (Schema + API Version)
Getting 400 from structured outputs? Fix API version mismatch, unsupported DateTime/Uri types, and model incompatibility. C# code fixes for Azure.AI.OpenAI 2.1.0.
Azure OpenAI context_length_exceeded Fix
Fix context_length_exceeded in Azure OpenAI C#. Count tokens, trim ChatHistory, use sliding windows, and prevent RAG prompt overflow.
Azure AI Search Vector Dimension Mismatch Fix
Fix Azure AI Search embedding dimension errors in C#. Match ada-002 or text-embedding-3 dimensions and reindex without downtime.
Ollama Connection Refused in C#: SK Fix
Fix Ollama connection refused in Semantic Kernel .NET. Correct localhost, host.docker.internal, Docker networking, and health checks.
Fix 'tool_calls Must Be Followed by Tool Messages' in Semantic Kernel C#
Getting 'tool_calls must be followed by tool messages'? Fix ChatHistory message ordering in manual function calling and FunctionInvokingChatClient.
Azure AI Search 429 and Indexing Fix
Fix Azure AI Search 429 throttling, index-not-found, and field mapping errors in .NET. Includes retry and indexing patterns in C#.
Azure OpenAI DeploymentNotFound: C# Fix
Fix DeploymentNotFound 404 in Azure OpenAI .NET. Use the deployment name, correct endpoint, API version, and C# configuration.
Fix Semantic Kernel Template HTML-Encoding & Plugin Serialization Errors
SK templates encoding your output as HTML? Complex types not serializing? Fix template rendering, KernelException, and breaking changes in SK 1.x.
Fix Azure OpenAI 503 Service Unavailable — Retry + Circuit Breaker + Failover
Azure OpenAI returning 503? Production-grade fix: Polly v8 retry, circuit breaker, and multi-region failover. C# code for .NET 10.
Azure OpenAI 429 in C#: Retry-After Fix
Fix Azure OpenAI 429 Too Many Requests in C#. Read Retry-After, tune SDK retries, add Polly backoff, and prevent retry storms.
Azure OpenAI 401 Unauthorized: C# Fix
Fix Azure OpenAI 401 Unauthorized in .NET. Check API key, endpoint, DefaultAzureCredential, RBAC role, and common config mistakes.
Azure OpenAI Model Not Found: C# Fix
Fix Azure OpenAI model_not_found in .NET. Use deployment name, check endpoint and API version, and verify the deployment with Azure CLI.
Semantic Kernel NuGet Conflict Fix
Fix Semantic Kernel and Azure.AI.OpenAI NuGet conflicts. Use compatible 2026 package sets for SK, Azure.AI.OpenAI, OpenAI, and MEAI.
Semantic Kernel Plugin Errors: C# Fix
Fix KernelFunction not found and Semantic Kernel plugin registration errors in C#. Check attributes, AddFromType, DI, and function discovery.
Fix CS8032 'An Instance of Analyzer Cannot Be Created' in .NET 8+
Resolve CS8032 analyzer errors in .NET 8/9 builds. Root causes: version mismatches, missing dependencies, and broken Roslyn analyzer packages. Quick fix inside.