Securing servers/services without VPN cần giải pháp nào? Dùng Cloudflare Tunnels + Traefik nhưng mTLS gặp vấn đề với app di động, đặc biệt là iOS. Cloudflare Zero Trust & NordVPN cũng bị xung đột. Tìm cách truy cập an toàn, dễ dùng cho client không dùng web browser. #securingServers #mTLS #Cloudflare #ServerSecurity #Android #iOS #Tailscale #NetworkSecurity

https://www.reddit.com/r/selfhosted/comments/1pof1x9/how_should_i_be_securing_my_serverservices_and/

Server Security Checklist — Essential Hardening Guide

Securing your servers isn’t optional — it’s your first line of defense against data breaches, ransomware, insider threats, and lateral movement. Use this checklist as a baseline for Linux, Windows, cloud, hybrid, or on-prem servers.

⸻

🔧 1. System & OS Hardening
• Keep OS & packages updated (apply security patches frequently).
• Remove / disable unused services & software.
• Enforce secure boot + BIOS/UEFI passwords.
• Disable auto-login and guest accounts.
• Use minimal OS images only (reduce attack surface).

⸻

🔐 2. Access Control
• Enforce strong passwords & MFA everywhere.
• Use RBAC & least privilege access.
• Disable root/Administrator login over SSH/RDP.
• Rotate credentials & keys regularly.
• Implement just-in-time access for privileged users.

⸻

🌐 3. Network Security
• Restrict inbound/outbound traffic via firewalls.
• Segment critical servers from general LANs/VLANs.
• Disable unused ports & protocols.
• Enable DoS/DDoS protection.
• Apply zero-trust network principles.

⸻

🔑 4. Secure Remote Access
• Use SSH key-based authentication (disable password login).
• Enforce VPN for admin access.
• Log & monitor all remote access sessions.
• Disable legacy protocols (Telnet, FTP, SMBv1).
• Require bastion/jump host for critical access.

⸻

📊 5. Logging & Monitoring
• Enable centralized logging (syslog / SIEM).
• Track failed login attempts & anomalies.
• Configure alerts for privilege escalation or config changes.
• Monitor log tampering.
• Retain logs securely for audits & forensics.

⸻

🔒 6. Data Protection
• Encrypt data at rest (LUKS, BitLocker, etc.).
• Encrypt data in transit (TLS 1.2+).
• Strict database access policies.
• Regular, offline, immutable backups.
• Test restore procedures (don’t assume backups work).

⸻

🔁 7. Application & Patch Management
• Keep middleware, frameworks, and apps patched.
• Delete default credentials & sample files.
• Enable code signing for software packages.
• Use secure coding practices (OWASP Top 10).
• Implement dependency scanning (Snyk, Trivy, etc.).

⸻

🛡️ 8. Malware & Intrusion Defense
• Deploy EDR/AV on endpoints.
• Enable IDS/IPS at network edge.
• Automatic vulnerability scans (schedule weekly/monthly).
• Monitor persistence techniques (cron, startup scripts).
• Block known malicious IP ranges & TLDs.

⸻

🏢 9. Physical & Cloud Security
• Restrict physical access to server racks/rooms.
• Enable provider security tools (AWS Security Groups, Azure NSG, IAM).
• Harden cloud images (CIS benchmarks).
• Review cloud logging & audit trails regularly.
• Disable unused cloud API keys / roles.

⸻

📜 10. Policy & Compliance
• Use CIS / NIST / ISO-27001 benchmarks.
• Track & document every access change.
• Force annual access reviews & key rotation.
• Perform regular security training for admins.
• Maintain disaster recovery & incident plans.

⸻

➕ Additional 5 Critical Controls (Advanced Hardening)

🧠 11. Privileged Access Management (PAM)
• Use jump hosts & session recording.
• Just-In-Time access for admins.
• Store keys in secure vaults (HashiCorp Vault, CyberArk).

🚨 12. Real-Time Threat Detection
• Use behavioral analytics → UEBA/XDR.
• AI-based anomaly detection recommended.
• Block suspicious IPs automatically.

🧪 13. Red Team & Pentesting
• Run regular internal pentests.
• Validate configuration weaknesses.
• Simulate phishing + lateral movement scenarios.

🧱 14. Container / VM Isolation
• Use AppArmor, SELinux, Seccomp profiles.
• Limit Docker socket access & root containers.
• Scan images before deployment.

📦 15. Automated Configuration Management
• Use IaC (Terraform, Ansible, Puppet) for repeatable and secure builds.
• Detect drift using compliance scanning.
• Version control all infrastructure.

⸻

🧠 Core Reminder

A server is only as secure as the team who maintains it.
Hardening isn’t one task — it’s an ongoing

#ServerSecurity #SystemHardening #InfoSec #CyberSecurity #BlueTeam
#DevSecOps #SysAdmin #ThreatDetection #AccessControl #NetworkSecurity
#LinuxSecurity #SecureArchitecture #RiskMitigation #SecurityChecklist
#CloudSecurity #InfrastructureSecurity #ZeroTrust #SecurityMonitoring

20,000 failed SSH logins in 2 days.
On a server hosting only a static webpage.

Recently, I was checking logs on a VM that I own. It has no backend, no database.
Just a static webpage served by NGINX.

Yet, I found 20k failed SSH login attempts.

A VM becomes a target the moment it’s online.

Fortunately, password logins were disabled. Here is my new server security routine (non-root user, SSH auth, fail2ban etc.):

https://nerdsid.com/posts/cyber-security/10-steps-to-make-a-new-linux-vm-safe/

#CyberSecurity #InfoSec #Linux #ServerSecurity

The Sony PlayStation hack of 2011 is considered the worst breach in gaming history. With 77 million users affected, this episode is often used as an example of the importance of timely patching of servers and firewall security.
Here's what happened and the lessons learnt.

#serverSecurity #patchDay #firewallSecurity #PSNhack #PlayStation #gaming

https://negativepid.blog/the-sony-playstation-network-hack/
https://negativepid.blog/the-sony-playstation-network-hack/

"Bạn đang dùng Cloudflare Tunnel để mở Jellyfin trên internet? Thiết lập Cloudflare Access với mã 1 lần gửi email. Không an toàn hay? #Cloudflare #Jellyfin #ServerSecurity #TruyCelInternet #MãMạo #AnT oneserver #MãMail"

https://www.reddit.com/r/selfhosted/comments/1oa1s8d/using_cloudflare_tunneling_for_accsess/

🚨 Threat Alert: WireTap Attack on Intel SGX Servers

Physical attacks can now compromise SGX enclaves using a low-cost DIY setup (<$1,000). Attackers can extract cryptographic keys, forge enclaves, and threaten blockchain/Web3 networks and confidential computation.

Mitigation considerations:
🛡 Restrict physical server access
🔑 Review SGX-dependent systems in blockchain & Web3
💡 Monitor for suspicious DRAM bus activity

#WireTap #IntelSGX #HardwareSecurity #CyberSecurity #SideChannelAttack #BlockchainSecurity #Web3 #ServerSecurity #Infosec

🚨 Threat Alert: WireTap Attack on Intel SGX Servers

Physical attacks can now compromise SGX enclaves using a low-cost DIY setup (<$1,000). Attackers can extract cryptographic keys, forge enclaves, and threaten blockchain/Web3 networks and confidential computation.

Mitigation considerations:
🛡 Restrict physical server access
🔑 Review SGX-dependent systems in blockchain & Web3
💡 Monitor for suspicious DRAM bus activity

#WireTap #IntelSGX #HardwareSecurity #CyberSecurity #SideChannelAttack #BlockchainSecurity #Web3 #ServerSecurity

📋 Server Security Checklist — Essential Hardening Guide 🛡️

Securing servers is critical to protect sensitive data, applications, and networks. Here’s a quick checklist every sysadmin and security engineer should follow to reduce risk and strengthen resilience. ⚡🔐

1️⃣ System & OS Hardening
🔹 Keep OS and packages updated (apply patches regularly).
🔹 Remove or disable unused services & software.
🔹 Configure secure boot and BIOS/UEFI passwords.

2️⃣ Access Control
🔹 Enforce strong passwords + MFA for all accounts.
🔹 Use role-based access (least privilege).
🔹 Disable root/administrator login over SSH/RDP.

3️⃣ Network Security
🔹 Restrict inbound/outbound traffic with firewalls.
🔹 Segment critical servers from general networks.
🔹 Disable unused ports & protocols.

4️⃣ Secure Remote Access
🔹 Use SSH with key-based auth (disable password logins).
🔹 Enforce VPNs for admin access.
🔹 Monitor and log remote sessions.

5️⃣ Logging & Monitoring
🔹 Enable centralized logging (syslog/SIEM).
🔹 Monitor failed login attempts & unusual activity.
🔹 Configure alerts for critical events.

6️⃣ Data Protection
🔹 Encrypt sensitive data at rest & in transit (TLS, disk encryption).
🔹 Regularly back up data to secure, offline storage.
🔹 Apply strict database access policies.

7️⃣ Application & Patch Management
🔹 Keep middleware, frameworks, and apps patched.
🔹 Remove default credentials and sample configs.
🔹 Use secure coding practices.

8️⃣ Malware & Intrusion Defense
🔹 Deploy antivirus/EDR for endpoints.
🔹 Enable IDS/IPS at the network edge.
🔹 Scan regularly for vulnerabilities.

9️⃣ Physical & Cloud Security
🔹 Restrict physical access to server rooms.
🔹 Harden cloud instances with provider tools (security groups, IAM).
🔹 Regularly review cloud audit logs.

🔟 Policy & Compliance
🔹 Apply CIS/NIST benchmarks.
🔹 Document access, configs, and changes.
🔹 Train admins in security best practices.

#ServerSecurity #CyberSecurity #InfoSec #BlueTeam #SysAdmin #ITSecurity #SecurityChecklist #DefensiveSecurity

🔧 You may not notice, but to improve server security, we’ve decided to disable IPv6. Since our provider, OVHCloud, doesn’t offer DDoS protection or edge firewall for IPv6, we made this decision to ensure a better and more stable service.

#ServerSecurity #IPv6 #OVHCloud #NetworkSafety #CyberSecurity