Hospital
Verified debugging solutions for Azure OpenAI, Semantic Kernel, and .NET AI errors. Root cause analysis and tested fixes — sourced from real production incidents.
Fix Azure OpenAI 400 Content Filter Error in C# (Including Streaming)
Azure OpenAI content_filter 400? Read inner error details, configure content policies in Azure Portal, and detect silent streaming failures. C# examples.
Fix 'context_length_exceeded' in Azure OpenAI C# — Token Counting + Sliding Window
Hit context_length_exceeded? Count tokens with Microsoft.ML.Tokenizers, implement sliding window chat history, and prevent overflow in RAG pipelines. C# code.
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.
Fix Vector Dimension Mismatch in Azure AI Search + C# (ada-002 vs text-embedding-3)
Embedding dimensions don't match your index? Fix ada-002 (1536) vs text-embedding-3 (3072/256) mismatches with zero-downtime re-indexing in C#.
Fix Ollama 'Connection Refused' in .NET Semantic Kernel (Docker + URL Fix)
HttpRequestException: Connection refused with Ollama? Fix Docker networking, endpoint URL format (localhost vs host.docker.internal), 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.
Fix Azure AI Search 429 Throttling + Index-Not-Found in .NET
Diagnose and fix the 3 most common Azure AI Search errors: 429 throttling, index-not-found, and field mapping mismatches. C# retry patterns included.
Fix DeploymentNotFound 404 in Azure OpenAI .NET — Name Mismatch Explained
DeploymentNotFound or ResourceNotFound 404? Deployment name != model name in Azure OpenAI. Configuration fix and endpoint debugging for C#.
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.
Fix Azure OpenAI 401 Unauthorized in C# — API Key, RBAC & DefaultAzureCredential
401 from Azure OpenAI? Check API key, DefaultAzureCredential config, missing RBAC role, and endpoint mismatches. Diagnostic steps with .NET 10 code.
Fix Azure OpenAI 429 Too Many Requests in C# — Retry-After + Circuit Breaker
Stop getting 429 from Azure OpenAI. SDK retry policies, Polly v8 circuit breakers, and Retry-After header handling. Working C# code for .NET 10.
Fix 'Model Not Found' in Azure OpenAI .NET — Deployment Name vs Model Name
Azure OpenAI model not found? It's the deployment name, not the model name. How to verify with Azure CLI and fix your C# configuration.
Fix NuGet Version Conflicts: Semantic Kernel + Azure.AI.OpenAI (2026 Version Sets)
NuGet conflicts between Semantic Kernel 1.54+, Azure.AI.OpenAI 2.x, and MEAI 10.3.0? Here are compatible version sets and alignment rules that work together.
Fix KernelFunction Not Found + Plugin Errors in Semantic Kernel .NET
KernelFunction not found? Plugin registration failing? Fix missing [Description] attributes, AddFromType issues, and function discovery in SK 1.x.
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.