Fix name encoding issues caused by surrogate pairs
- Published: 2026.10.04
- Updated: 2026.10.04
- Technology
Trace supplementary Unicode characters through input, transport, storage and fonts, with UTF-16 examples and MySQL utf8mb4 checks.
English technical notes
Selected articles on programming and system administration.
Fix a long DKIM TXT value in Amazon Route 53
- Published: 2026.10.04
- Updated: 2026.10.04
- Cloud Infrastructure
Resolve CharacterStringTooLong by keeping quoted DKIM chunks in one Route 53 TXT value, rather than creating separate values on new lines.
Change a Git remote URL after moving a repository
- Published: 2026.10.04
- Updated: 2026.10.04
- Development Technology
Update an existing Git clone to a moved repository, check fetch and push URLs, and verify access without recloning.
Windows SSH config not applied? Inspect it with ssh -G
- Published: 2026.10.04
- Updated: 2026.10.04
- Technology Windows
Find the SSH executable and client config file, inspect Host matches, and diagnose setting order and command-line overrides with ssh -G.
Test TCP ports on Windows with Test-NetConnection
- Published: 2026.10.04
- Updated: 2026.10.04
- Infrastructure Windows
Check SSH or HTTPS TCP connectivity on Windows and distinguish network reachability from DNS, authentication and certificate failures.
Troubleshoot DNS on Windows with Resolve-DnsName
- Published: 2026.10.04
- Updated: 2026.10.04
- Infrastructure Windows
Query A and AAAA records, inspect configured DNS servers, and compare a specific resolver without changing Windows DNS settings.
Counting characters in JavaScript: length, Array.from and Intl.Segmenter
- Published: 2026.10.04
- Updated: 2026.10.04
- Development
Compare UTF-16 code units, Unicode code points and grapheme clusters. Count and shorten names and emoji without breaking them.