20
DNS
20 BADNAME
Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
このコードが表示される場合
A TKEY key establishment failed because a key with the same name already exists on the server from a previous session that was not properly cleaned up.
解決方法
Use a unique key name for each TKEY session (e.g., append a timestamp or random suffix). Delete stale keys on the server if they are no longer needed.
比較対象
ガイド
HTTP Request Lifecycle: From URL to Response
HTTP Fundamentals
Step-by-Step DNS Troubleshooting with dig and nslookup
Debugging & Troubleshooting
Improving Email Deliverability: SPF, DKIM, and DMARC Setup
Email Delivery
DNS Response Codes (RCODEs) Explained
DNS & Networking
DNS TTL: How to Set TTL Values and Avoid Propagation Delays
DNS & Networking
DNS Propagation: Why Changes Take Time
DNS & Networking
DNSSEC Implementation Guide
DNS & Networking
DNS-Based Failover and High Availability
DNS & Networking
DNS Record Types Explained: A, AAAA, CNAME, MX, TXT, and Beyond
DNS & Networking
DNS over HTTPS (DoH) and DNS over TLS (DoT): Encrypted DNS Explained
DNS & Networking
Essential Network Debugging Tools: ping, traceroute, mtr, and tcpdump
DNS & Networking
Resource Hints: Preload, Prefetch, Preconnect, and DNS-Prefetch
Performance & Optimization
RFC 9114: HTTP/3 Protocol Deep Dive
Protocol Deep Dives
RFC 3261: SIP Protocol Deep Dive
Protocol Deep Dives
QUIC Protocol: The Transport Layer Behind HTTP/3
Protocol Deep Dives
Migrating from TLS 1.2 to TLS 1.3: Configuration and Compatibility
Migration & Upgrades
Secret Management for API Keys, Tokens, and Certificates
Production Infrastructure
用語集
TCP/IP
Port Number
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Firewall
DNS over HTTPS (DoH)
IPv6
Subnet (Subnetwork)
MTU (Maximum Transmission Unit)
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DNS Lookup
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Request-Response Model
RFC (Request for Comments)
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Connectionless
Text vs Binary Protocol
DNS Resolution
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SPF, DKIM, and DMARC
Email Deliverability
MTA (Mail Transfer Agent)
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BIMI (Brand Indicators for Message Identification)
Service Discovery
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