Port Security Guides

What is port X? Security guides for common network ports

Port 5000 (Docker Registry): What It Is & Security Guide

Port 5000 is for Docker Registry. Learn its high security risks, how to check if it's open, common attacks, and …

May 16, 2026

Port 3128 (Squid): What It Is & Security Guide

Understand TCP port 3128, the default for Squid HTTP proxy. Learn about its functions, medium security risks like open proxy …

May 16, 2026

Port 1080 (SOCKS): What It Is & Security Guide

Port 1080 (SOCKS) is a high-risk TCP port. Learn its function, security threats, common attacks, and how to secure it …

May 16, 2026

Port 873 (rsync): What It Is & Security Guide

Understand TCP port 873, the rsync service, its security risks, and essential hardening steps to protect your data from unauthorized …

May 16, 2026

Port 548 (AFP): What It Is & Security Guide

Understand TCP port 548, the Apple Filing Protocol (AFP), its security risks, and essential steps to protect your network from …

May 16, 2026

Port 51820 (WireGuard): What It Is & Security Guide

Understand port 51820, the default UDP port for WireGuard VPN. Learn about its low security risks, how to check if …

May 16, 2026

Port 1194 (OpenVPN): What It Is & Security Guide

Port 1194 is key for OpenVPN, enabling secure remote access. Understand its low security risk, potential vulnerabilities, and crucial steps …

May 16, 2026

Port 636 (LDAPS): What It Is & Security Guide

Port 636 (LDAPS) secures directory services. Understand its purpose, critical security risks (data exposure, unauthorized access), and how to protect …

May 16, 2026

Port 389 (LDAP): What It Is & Security Guide

Port 389 (LDAP) is critical for directory services but poses high security risks like data breaches and unauthorized access. Learn …

May 16, 2026

Port 161 (SNMP): What It Is & Security Guide

Understand UDP port 161 (SNMP), its critical security risks, common attacks, and essential hardening steps. Learn how to check, secure, …

May 16, 2026

Port 4443 (Pharos): What It Is & Security Guide

Uncover the secrets of Port 4443 (Pharos), its role in admin panels, and the medium security risks it poses. Learn …

May 16, 2026

Port 9000 (SonarQube): What It Is & Security Guide

Explore TCP port 9000, the default for SonarQube, a leading code quality platform. Understand its security risks, common attacks, and …

May 16, 2026

Port 5601 (Kibana): What It Is & Security Guide

Uncover the critical security risks of TCP port 5601, the default for Kibana dashboards. Learn what Kibana is, how to …

May 16, 2026

Port 1883 (MQTT): What It Is & Security Guide

Uncover the critical security risks of TCP port 1883 (MQTT), the IoT messaging protocol. Learn how to identify open ports, …

May 16, 2026

Port 2181 (ZooKeeper): What It Is & Security Guide

Port 2181 is Apache ZooKeeper's default. Understand its high security risks, common attacks, and essential hardening steps like firewalls, authentication, …

May 16, 2026

Port 2379 (etcd): What It Is & Security Guide

Understand TCP port 2379, the critical etcd key-value store, its severe security risks, and essential hardening steps to protect your …

May 16, 2026

Port 6443 (Kubernetes API): What It Is & Security Guide

Understand TCP port 6443, the critical entry point to the Kubernetes API server. Learn about its severe security risks, common …

May 16, 2026

Port 5672 (RabbitMQ): What It Is & Security Guide

Understand TCP port 5672, the default for RabbitMQ (AMQP message broker). Learn its security risks, common attacks, and essential hardening …

May 16, 2026

Port 27017 (MongoDB): What It Is & Security Guide

Port 27017 is MongoDB's default. Discover its critical security risks, common attacks, and vital steps to protect your database from …

May 16, 2026

Port 11211 (Memcached): What It Is & Security Guide

Understand TCP/UDP port 11211, its role with Memcached, and the high security risks it poses. Learn how to protect your …

May 16, 2026

Port 9200 (Elasticsearch): What It Is & Security Guide

Understand TCP port 9200, its role with Elasticsearch, critical security risks of exposure, and essential steps to protect your data …

May 16, 2026

Port 9090 (Web Admin): What It Is & Security Guide

Understand TCP port 9090, its use for Web Admin interfaces, associated security risks like RCE and unauthorized access, and essential …

May 16, 2026

Port 8888 (HTTP Alt): What It Is & Security Guide

Understand TCP port 8888 (HTTP Alt), its purpose, medium security risks, and essential steps to protect your systems from common …

May 16, 2026

Port 8443 (HTTPS Alt): What It Is & Security Guide

Uncover the truth about Port 8443 (HTTPS Alt). Learn its purpose, identify potential security risks, and implement robust protection strategies …

May 16, 2026

Port 8080 (HTTP Proxy): What It Is & Security Guide

Explore TCP port 8080, commonly used for HTTP proxies and alternative web services. Understand its security risks, common attacks, and …

May 16, 2026

Port 6379 (Redis): What It Is & Security Guide

Understand TCP port 6379, its use by Redis, critical security risks like RCE and data theft, and essential steps to …

May 16, 2026

Port 5900 (VNC): What It Is & Security Guide

Understand TCP port 5900 (VNC), its critical security risks like RCE and data theft, and learn how to protect your …

May 16, 2026

Port 5432 (PostgreSQL): What It Is & Security Guide

Understand TCP/UDP port 5432, its role with PostgreSQL databases, critical security risks, and essential steps to protect your data from …

May 16, 2026

Port 3389 (RDP): What It Is & Security Guide

Uncover the critical security risks of TCP port 3389 (RDP). Learn what Remote Desktop Protocol is, common attacks, and essential …

May 16, 2026

Port 3306 (MySQL): What It Is & Security Guide

Understand TCP port 3306, the default for MySQL databases. Learn about its high security risks, common attacks, and essential hardening …

May 16, 2026

Port 2049 (NFS): What It Is & Security Guide

Understand TCP/UDP port 2049, the Network File System (NFS) protocol, its high security risks, and essential hardening steps. Learn how …

May 16, 2026

Port 1521 (Oracle DB): What It Is & Security Guide

Explore TCP port 1521, the default for Oracle Database. Understand its security risks, common attacks, and essential hardening steps to …

May 16, 2026

Port 1433 (MSSQL): What It Is & Security Guide

Port 1433 (MSSQL) is a high-risk port. Understand its function, common attacks, how to check if it's open, and essential …

May 16, 2026

Port 995 (POP3S): What It Is & Security Guide

Port 995 (POP3S) is for secure email retrieval. Understand its function, low security risks, and how misconfigurations can expose data. …

May 16, 2026

Port 993 (IMAPS): What It Is & Security Guide

Understand TCP port 993 (IMAPS) for secure email retrieval. Learn about its low security risk, common attacks, how to check …

May 16, 2026

Port 587 (SMTP Submission): What It Is & Security Guide

Understand TCP port 587 for SMTP Submission: its purpose, technical details, security risks like spam relay and brute-force, and essential …

May 16, 2026

Port 465 (SMTPS): What It Is & Security Guide

Understand TCP port 465 (SMTPS) for secure email submission. Learn its purpose, security risks, common attacks, and essential hardening steps …

May 16, 2026

Port 445 (SMB): What It Is & Security Guide

Understand TCP port 445 (SMB), its critical security risks like ransomware & data breaches, and learn essential steps to protect …

May 16, 2026

Port 443 (HTTPS): What It Is & Security Guide

Understand TCP port 443 for HTTPS, its low inherent security risks, common attacks like Heartbleed, and essential hardening steps to …

May 16, 2026

Port 143 (IMAP): What It Is & Security Guide

Secure your email! Port 143 (IMAP) is for email retrieval. Learn its security risks, common attacks, and essential hardening steps …

May 16, 2026

Port 139 (NetBIOS): What It Is & Security Guide

Understand TCP port 139 (NetBIOS Session Service), its high security risks, and how to protect your systems. Learn to identify …

May 16, 2026

Port 135 (MS-RPC): What It Is & Security Guide

Understand TCP port 135 (MS-RPC), its critical security risks, and essential hardening steps to protect your Windows systems from remote …

May 16, 2026

Port 111 (RPCbind): What It Is & Security Guide

Understand TCP/UDP port 111 (RPCbind), its high security risks including DDoS amplification and information disclosure, and learn essential hardening steps …

May 16, 2026

Port 110 (POP3): What It Is & Security Guide

Understand TCP port 110 (POP3), its high security risks like plaintext credentials and brute-force attacks, and learn how to secure …

May 16, 2026

Port 80 (HTTP): What It Is & Security Guide

Understand TCP Port 80 (HTTP), its security risks like data interception and web server vulnerabilities, and essential hardening steps to …

May 16, 2026

Port 53 (DNS): What It Is & Security Guide

Secure Port 53 (DNS): Learn its vital role, common security risks like DNS amplification and cache poisoning, and essential hardening …

May 16, 2026

Port 25 (SMTP): What It Is & Security Guide

Understand TCP port 25 (SMTP) for email transfer. Learn its security risks, common attacks, how to check if it's open, …

May 16, 2026

Port 23 (Telnet): What It Is & Security Guide

Understand TCP port 23 (Telnet), its critical security risks like unencrypted data and credential theft, and learn how to disable, …

May 16, 2026

Port 22 (SSH): What It Is & Security Guide

Understand Port 22 (SSH): its purpose, security risks, and essential hardening techniques. Learn how to protect your servers from brute-force …

May 16, 2026

Port 21 (FTP): What It Is & Security Guide

Understand TCP Port 21 (FTP): its function, high security risks like data interception and brute-force attacks, and essential steps to …

May 16, 2026

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