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Recently added and updated content on Enterno.io knowledge base. 900+ pages total across glossary, how-to, ports, alternatives, SSL errors, research. Updated daily.

April 2026 (90)

  1. New pSEO
    Research: npm ecosystem security 2026

    npm supply-chain security 2026: typosquatting, dependency confusion, compromised maintainers. Sigstore, SBOM.

  2. New pSEO health
    Research: HTTP/3 adoption at top CDNs 2026

    HTTP/3 (QUIC) support at Cloudflare, Fastly, Akamai, AWS CloudFront, Bunny.net. Traffic share 2026.

  3. New pSEO
    Research: WebGPU adoption in browsers 2026

    Adoption report for WebGPU across Chrome, Safari, Firefox in 2026. Compute shaders, WGSL, Web ML use-cases.

  4. New pSEO
    Research: passkeys adoption 2026

    Passkeys (WebAuthn + FIDO2) adoption 2026: Apple/Google/Microsoft sync, top sites, user conversion.

  5. New pSEO
    Research: bot traffic evolution 2024-2026

    Bot traffic evolution 2024-2026: AI scrapers (GPTBot, ClaudeBot), legitimate vs malicious bots, mitigation.

  6. New pSEO
    SendGrid — alternatives and comparison

    SendGrid (Twilio) — transactional email API. Rivals: Postmark, AWS SES, Resend, Mailgun, Brevo. Inbox placement, pricing.

  7. New pSEO
    Tower Git — alternatives and comparison

    Tower — Git GUI for macOS/Windows, paid ($70/yr), native, fast. Alternatives: Fork, GitHub Desktop, SourceTree, GitKraken.

  8. New pSEO
    Mailchimp — alternatives and comparison

    Mailchimp — email-marketing SaaS. Rivals: Brevo (Sendinblue), ConvertKit, MailerLite, Loops, Substack, Ghost newsletter.

  9. New pSEO
    GitKraken — alternatives and comparison

    GitKraken — cross-platform Git GUI with built-in merge editor, GitHub/GitLab integration. Free since 2022 only for personal use. Alternatives: Tower, Fork, SourceTree, lazygit.

  10. New pSEO
    HubSpot — alternatives and comparison

    HubSpot CRM alternatives: Pipedrive, Attio, Close, Zoho CRM, Salesforce. Pricing, API, integrations.

  11. New pSEO
    Salesforce — alternatives and comparison

    Salesforce CRM — enterprise. Alternatives: HubSpot, Microsoft Dynamics 365, Zoho CRM, Attio, Creatio. For mid-market.

  12. New pSEO ssl
    Schannel 0x80072f7d — Security channel error (Windows)

    Windows Schannel 0x80072F7D: security error occurred. TLS version, cipher mismatch, Windows Update.

  13. New pSEO ssl
    curl error 77: problem with CA cert file

    curl: (77) problem with the SSL CA cert. CURLE_SSL_CACERT_BADFILE. CURL_CA_BUNDLE, --cacert, ca-certificates.

  14. New pSEO ssl
    Trust anchor for certification path not found (Android)

    Android SSL: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found. Causes, fix.

  15. New pSEO ssl
    sun.security.validator.ValidatorException: PKIX path building failed

    Java PKIX path building failed: incomplete chain, missing CA in cacerts. keytool import, debug -Djavax.net.debug.

  16. New pSEO ssl
    Python ssl.SSLCertVerificationError: CERTIFICATE_VERIFY_FAILED

    Python requests/urllib3: CERTIFICATE_VERIFY_FAILED. certifi, SSL_CERT_FILE, macOS, corporate proxy.

  17. New pSEO ssl
    SEC_ERROR_OCSP_OLD_RESPONSE (Firefox)

    Firefox/NSS SEC_ERROR_OCSP_OLD_RESPONSE: OCSP response is stale. Must-Staple, nextUpdate, OCSP cache.

  18. Updated pSEO ping
    Port 8554 — RTSP (alternate to 554)

    TCP port 8554 — RTSP: IP cameras, streaming. ONVIF, VLC, ffmpeg. Alternate to the default 554.

  19. New pSEO ping
    Port 28910 — Nintendo Wi-Fi Connection

    TCP port 28910 — Nintendo Wi-Fi Connection / GameSpy: DS, Wii, 3DS matchmaking. Legacy-only service.

  20. New pSEO ping
    Port 502 — Modbus TCP

    TCP port 502 (Modbus TCP): industrial SCADA/PLC protocol, IoT gateways. Security: no auth, must be isolated.

  21. New pSEO ping
    Port 47808 — BACnet/IP

    UDP port 47808 (0xBAC0) — BACnet/IP: HVAC, lighting, access control in buildings.

  22. New pSEO ping
    Port 20000 — DNP3

    TCP port 20000 (DNP3): protocol for power/water utilities. Secure Authentication v5, IEC 62351.

  23. Updated pSEO ssl
    Port 8883 — MQTT over TLS

    TCP port 8883 — MQTT over TLS: encrypted IoT messaging. AWS IoT Core, HiveMQ, Mosquitto TLS.

  24. New pSEO health
    Tune Redis Memory

    Redis memory tuning: maxmemory-policy, eviction, MEMORY USAGE, TTL, fragmentation, jemalloc.

  25. New pSEO health
    Tune PostgreSQL Performance

    Postgres performance tuning: shared_buffers, work_mem, vacuum, pg_stat_statements, indexes. 2026 playbook.

  26. New pSEO health
    Fix Kafka Consumer Lag

    Kafka consumer lag: causes, diagnosis via kafka-consumer-groups, scaling partitions, tuning max.poll.records.

  27. New pSEO security
    Configure Rate Limiting in nginx

    Nginx rate limiting: limit_req_zone, burst, nodelay, 429 responses, fail2ban integration.

  28. New pSEO security
    Configure Ingress in Kubernetes

    Ingress in Kubernetes: nginx-ingress-controller, TLS via cert-manager, path/host-based routing, rate-limit annotations.

  29. New pSEO health
    Run an Incident Response

    Incident response playbook: severity triage, comms, postmortem. ICS incident commander, SRE framework.

  30. New pSEO check
    WebGPU — GPU API for the web

    WebGPU: WebGL replacement, compute shaders, WGSL, access to Vulkan/Metal/D3D12. Chrome 113+, Firefox 141+.

  31. New pSEO check
    WASI — WebAssembly System Interface

    WASI: POSIX-like interface for WASM outside the browser. WASI 0.2, preview2, wasmtime, Fastly, Fermyon Spin.

  32. New pSEO check
    WebAssembly Component Model

    WebAssembly Component Model: WIT interfaces, portable binaries, language interop. Wasmtime, JCO, ComponentizeJS.

  33. New pSEO check
    Rust web frameworks — Axum, Actix, Rocket

    Rust web frameworks in 2026: Axum, Actix Web, Rocket, Warp. Comparison, latency, the Tokio async runtime.

  34. New pSEO health
    OpenTelemetry Collector

    OTel Collector: receivers, processors, exporters. Vendor-agnostic telemetry pipeline — traces, metrics, logs.

  35. New pSEO check
    Serverless Containers — Cloud Run, Fargate, Fly

    Serverless containers: Cloud Run, ECS Fargate, Fly Machines. Container instead of function, scale-to-zero, no cold start.

  36. New pSEO health
    Distributed Tracing — Following Requests

    Distributed tracing: spans, trace-ID, OpenTelemetry, Jaeger, Tempo. How to debug microservices.

  37. New pSEO check
    Cloudflare R2 — S3-compatible storage

    Cloudflare R2: zero egress fee, S3 API, rclone, hosted on 300+ locations. Compared with S3 / B2 / Wasabi.

  38. New pSEO check
    Grafana Loki Alternatives 2026 — Log Aggregation

    Grafana Loki — cheap log storage (label-indexed). Alternatives: Elasticsearch, OpenSearch, ClickHouse, Quickwit, VictoriaLogs.

  39. New pSEO check
    Snowflake Alternatives 2026 — Cloud Data Warehouse

    Snowflake — market leader cloud warehouse. Alternatives: BigQuery (Google), Redshift (AWS), Databricks, ClickHouse Cloud, DuckDB.

  40. New pSEO check
    Looker Alternatives 2026 — BI / Semantic Layer

    Looker (Google) — BI with semantic layer. Alternatives: Metabase, Superset, Cube, Preset, Lightdash, Mode.

  41. New pSEO check
    Apache Airflow Alternatives 2026 — Data Orchestration

    Apache Airflow — de-facto workflow orchestrator. Alternatives: Prefect, Dagster, Temporal, Mage, Kestra, Argo Workflows.

  42. New pSEO check
    Fivetran Alternatives 2026 — Managed ETL/ELT

    Fivetran — #1 managed ELT (350+ connectors). Alternatives: Airbyte (open source), Stitch, Hevo, Estuary, Rivery.

  43. New pSEO check
    ClickHouse Alternatives 2026 — Analytics DB

    ClickHouse — open-source OLAP, Yandex origin. Alternatives: DuckDB, Apache Pinot, StarRocks, Druid, MonetDB.

  44. New pSEO check
    Segment Alternatives 2026 — CDP (Customer Data)

    Twilio Segment — leading CDP. Alternatives: RudderStack (open), Snowplow, Jitsu, Avo, Freshpaint, PostHog.

  45. New pSEO check
    Vercel Alternatives 2026 — Next.js Hosting

    Vercel — #1 Next.js deploy. Alternatives: Netlify, Cloudflare Pages, AWS Amplify, Render, Railway, self-host.

  46. New pSEO check
    Grafana Alternatives 2026 — Observability Dashboards

    Grafana — #1 OSS dashboards. Alternatives: Datadog, New Relic, Chronograf, Kibana, Prometheus Console. Self-host vs SaaS.

  47. New pSEO check
    Honeycomb Alternatives 2026 — Distributed Tracing

    Honeycomb — observability for high-cardinality queries. Alternatives: Datadog, Lightstep, Jaeger, Tempo, Chronosphere.

  48. New pSEO ssl
    ERR_SSL_SERVER_CERT_BAD_FORMAT — Malformed Cert

    Chrome ERR_SSL_SERVER_CERT_BAD_FORMAT — cert not parseable. ASN.1 encoding error, truncated cert, non-DER format.

  49. New pSEO ssl
    ERR_QUIC_HANDSHAKE_FAILED — Initial Handshake

    Chrome ERR_QUIC_HANDSHAKE_FAILED — TLS 1.3 handshake inside QUIC failed. Causes: cert issues, cipher mismatch, version negotiation.

  50. Updated pSEO ssl
    ERR_QUIC_PROTOCOL_ERROR — Chrome HTTP/3

    Chrome ERR_QUIC_PROTOCOL_ERROR — QUIC transport error. Causes: CDN misconfig, middlebox interference, NAT UDP drops.

  51. New pSEO ssl
    ERR_INCOMPLETE_CHUNKED_ENCODING — Truncated Response

    Chrome ERR_INCOMPLETE_CHUNKED_ENCODING — chunked response interrupted before final 0-size chunk. Timeout, crash, network disconnect.

  52. New pSEO ssl
    NET::ERR_INVALID_HTTP_RESPONSE — Malformed Response

    Chrome ERR_INVALID_HTTP_RESPONSE — server returned HTTP data that does not conform to HTTP/1.1 RFC. Proxy corruption, content-length mismatch.

  53. New pSEO ssl
    ERR_SSL_UNRECOGNIZED_NAME_ALERT — SNI Mismatch

    Chrome ERR_SSL_UNRECOGNIZED_NAME_ALERT — server did not recognise client SNI hostname. Misconfigured virtual hosts.

  54. New pSEO ssl
    ERR_QUIC_TIMEOUT — HTTP/3 Connection Timeout

    Chrome ERR_QUIC_TIMEOUT — QUIC session timed out. Causes: UDP packet loss, slow network, NAT hairpinning issues.

  55. New pSEO ssl
    ERR_HPACK_DECODING_FAILED — HTTP/2 Header

    Chrome ERR_HPACK_DECODING_FAILED — HTTP/2 HPACK decompression error. Malformed headers, encoder state corruption.

  56. New pSEO ssl
    ERR_ECH_REQUIRED — Encrypted Client Hello

    Chrome ERR_ECH_REQUIRED — server signalled that ECH (Encrypted Client Hello) is required. Needs HTTPS record + ECH support.

  57. New pSEO ssl
    ERR_DNS_MALFORMED_RESPONSE — DNS Reply Invalid

    Chrome ERR_DNS_MALFORMED_RESPONSE — DNS resolver received invalid response. DoH/DoT misconfig, DNSSEC failures.

  58. New pSEO ping
    Port 10000 (TCP) — Webmin / VPN admin

    Port 10000 is used by Webmin / VPN admin. Standard port for Webmin / BackupPC. Security, how to check, best practices.

  59. New pSEO ping
    Port 7777 (TCP/UDP) — Unreal Tournament / Terraria / Ark: Survival

    Port 7777 is used by Unreal Tournament / Terraria / Ark: Survival. Standard port for Unreal / Terraria / Ark. Security, how to check, best practices.

  60. New pSEO ping
    Port 19132 (UDP) — Minecraft Bedrock Edition server

    Port 19132 is used by Minecraft Bedrock Edition server. Standard port for Minecraft Bedrock. Security, how to check, best practices.

  61. Published Article SSL
    Wildcard vs SAN-сертификат: когда какой выбрать в 2026

    Wildcard vs SAN сертификат — разбор отличий, цены, безопасность и автоматизация. Какой тип сертификата выбрать для разных архитектур и сколько доменов покрыть.

  62. Published Article SSL
    SSL Handshake Failed: причины ошибки и пошаговая диагностика

    SSL handshake failed — подробный разбор причин и диагностики: протоколы, SNI, cipher suites, сертификаты клиента. Примеры openssl и curl для отладки.

  63. Published Article SSL
    Слабые cipher suites: как найти и отключить небезопасные шифры TLS

    Слабые cipher suites (RC4, 3DES, MD5, EXPORT) снижают оценку SSL Labs до B или F. Как проверить, отключить в nginx и выбрать безопасный набор.

  64. Published Article SSL
    Mixed Content: как найти и исправить HTTP-ресурсы на HTTPS-сайте

    Mixed content блокирует скрипты и стили на HTTPS-сайте. Научим находить HTTP-ресурсы, чинить их автоматически через CSP и upgrade-insecure-requests.

  65. Published Article SSL
    TLS 1.3 vs TLS 1.2: What Changed and How to Migrate Correctly

    TLS 1.3 vs TLS 1.2 — detailed comparison: speed, security, compatibility. Step-by-step nginx migration guide with backward compatibility notes.

  66. Published Article SSL
    Wildcard vs SAN Certificate: Which to Choose in 2026

    Wildcard vs SAN certificates — differences, pricing, security, automation. Which cert type to pick for different architectures and how many domains to cover.

  67. Published Article SSL
    Expired SSL Certificate: How to Fix NET::ERR_CERT_DATE_INVALID

    Expired SSL certificate? Learn how to quickly diagnose and fix NET::ERR_CERT_DATE_INVALID, renew the certificate, and set up monitoring to prevent it.

  68. Published Article SSL
    Weak Cipher Suites: How to Find and Disable Insecure TLS Ciphers

    Weak cipher suites (RC4, 3DES, MD5, EXPORT) drop SSL Labs grade to B or F. Learn how to detect them, disable in nginx, and pick a safe set.

  69. Published Article SSL
    HSTS and HSTS Preload: Complete Guide to Forced HTTPS

    HSTS and preload list — how to force browsers to always use HTTPS. Strict-Transport-Security setup, hstspreload.org submission, gotchas.

  70. Published Article SSL
    HSTS и HSTS Preload: полное руководство по принудительному HTTPS

    HSTS и preload-лист — как заставить браузер всегда использовать HTTPS. Настройка Strict-Transport-Security, подача в hstspreload.org, подводные камни.

  71. Published Article SSL
    Self-signed certificate: когда использовать и как избежать предупреждений

    Self-signed SSL сертификат: зачем нужен, как создать через openssl, добавить в trust store и когда лучше использовать Let's Encrypt или внутреннюю PKI.

  72. Published Article SSL
    Бесплатный SSL через Let's Encrypt: установка certbot за 10 минут

    Бесплатный SSL-сертификат через Let's Encrypt и certbot: пошаговая установка на nginx, Apache, автообновление и подводные камни. Работает на любом Linux.

  73. Published Article SSL
    Mixed Content: How to Find and Fix HTTP Resources on HTTPS Sites

    Mixed content breaks scripts and styles on HTTPS. Learn how to find HTTP resources, fix them with CSP and upgrade-insecure-requests automatically.

  74. Published Article SSL
    Просроченный SSL-сертификат: как исправить ошибку NET::ERR_CERT_DATE_INVALID

    Просрочен SSL-сертификат? Узнайте, как быстро диагностировать и исправить ошибку NET::ERR_CERT_DATE_INVALID, продлить сертификат и настроить мониторинг.

  75. Published Article SSL
    Incomplete SSL Certificate Chain: How to Diagnose and Fix It

    Incomplete SSL chain causes errors on mobile and API clients. Learn how to assemble fullchain.pem, add intermediates, and verify the chain.

  76. Published Article SSL
    Self-Signed Certificates: When to Use Them and How to Avoid Warnings

    Self-signed SSL certificates: when they're appropriate, how to create them with openssl, trust them system-wide, and when to use Let's Encrypt or internal PKI instead.

  77. Published Article SSL
    TLS 1.3 vs TLS 1.2: что изменилось и как правильно мигрировать

    TLS 1.3 vs TLS 1.2 — подробное сравнение: скорость, безопасность, совместимость. Пошаговое руководство по миграции nginx и обратной совместимости.

  78. Published Article SSL
    Free SSL via Let's Encrypt: Install certbot in 10 Minutes

    Free SSL certificate via Let's Encrypt and certbot: step-by-step install for nginx, Apache, auto-renewal, and gotchas. Works on any Linux.

  79. Published Article SSL
    SSL Handshake Failed: Root Causes and Step-by-Step Diagnosis

    SSL handshake failed — deep dive into causes and diagnosis: protocols, SNI, cipher suites, client certs. openssl and curl examples for debugging.

  80. Published Article SSL
    Неполная цепочка SSL-сертификата: как найти и исправить incomplete chain

    Неполная цепочка SSL (incomplete chain) — причина ошибок у мобильных клиентов и API. Как собрать fullchain.pem, добавить intermediate и проверить цепочку.

  81. Published Article SEC
    SQL Injection Prevention: Prepared Statements and ORM

    SQL injection types, prepared statements, PDO, ORM safety, least privilege DB users, WAF. Examples in PHP, Node.js, Python.

  82. Published Article SEC
    Защита от SQL injection: prepared statements и ORM

    SQL injection: типы атак, prepared statements, PDO, параметризация, ORM, least privilege, WAF. Примеры PHP, Node.js, Python.

  83. Published Article SEC
    Защита от XSS атак: типы, эскейпинг, CSP, Trusted Types

    XSS атаки: stored, reflected, DOM-based. Защита: HTML-эскейпинг, контекстная санитизация, CSP, Trusted Types. Примеры кода и проверка.

  84. Published Article SEC
    CORS: Complete Guide to Access-Control-Allow

    CORS, preflight OPTIONS, Access-Control-Allow-Origin, credentials, common errors. nginx/Express/NestJS setup and curl debugging.

  85. Published Article SEC
    Защита от Clickjacking: X-Frame-Options vs frame-ancestors

    Clickjacking атаки: как работают, X-Frame-Options, CSP frame-ancestors, SameSite cookies, JS frame-busting. Настройка nginx и проверка защиты.

  86. Published Article SEC
    CSP (Content Security Policy): настройка с нуля

    Настройка Content Security Policy: директивы, nonce, strict-dynamic, report-uri. Готовые примеры для nginx и Next.js, отладка и типичные ошибки.

  87. Published Article SEC
    CORS: полное руководство по Access-Control-Allow

    CORS, preflight OPTIONS, Access-Control-Allow-Origin, credentials, типичные ошибки. Настройка nginx, Express, NestJS и отладка через curl.

  88. Published Article SEC
    Prevent XSS Attacks: Escaping, CSP and Trusted Types

    XSS types — stored, reflected, DOM-based — and how to stop them with context-aware escaping, CSP, Trusted Types, and HttpOnly cookies.

  89. Published Article SEC
    Clickjacking Prevention: X-Frame-Options vs frame-ancestors

    Clickjacking attacks explained: X-Frame-Options, CSP frame-ancestors, SameSite cookies, JS frame-busting. nginx setup and verification.

  90. Published Article SEC
    Миграция с HTTP на HTTPS: редиректы, mixed content, HSTS

    Переход с HTTP на HTTPS: получение сертификата, 301 редирект, fix mixed content, HSTS, canonical URL, SEO без потерь трафика.

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