Bottom Line: Getting security right at deployment time prevents expensive fixes later. This checklist covers essential configurations for new IT infrastructure, organized by implementation phase and priority.

Priority Legend

Icon	Priority	Timeline	Impact if Skipped
🔴	Critical	Before go-live	Immediate vulnerability; potential breach
🟡	High	Within first week	Significant security gap
🟢	Medium	Within first month	Reduced security posture

Phase 1: Pre-Deployment Planning

Complete these items before purchasing equipment or installing software.

Risk Assessment & Classification

🔴 Conduct a full risk assessment identifying protection priorities
🔴 Classify critical assets by sensitivity (customer data, financial records, IP)
🔴 Identify applicable compliance requirements (HIPAA, SOX, PCI-DSS, CMMC)
🟡 Document business impact analysis for critical systems

Policy Documentation

🔴 Create acceptable use policy
🔴 Document password standards and requirements
🔴 Establish access control procedures
🔴 Develop incident response plan
🟡 Define data classification policy
🟡 Create vendor/third-party access policy

Phase 2: Network Security

Secure the network perimeter and internal boundaries.

Firewall Configuration

Task	Priority	Verification
Install firewalls at network perimeter	🔴 Critical	Firewall operational, logs flowing
Configure internal boundary firewalls	🔴 Critical	Segmentation rules active
Block unnecessary ports and protocols	🔴 Critical	Port scan confirms closure
Enable logging and monitoring	🔴 Critical	Logs visible in SIEM/monitoring
Test firewall rules before deployment	🔴 Critical	Documented test results

Firewall Checklist

🔴 Perimeter firewall installed and configured
🔴 Default deny rule implemented (block all, allow specific)
🔴 Guest network completely isolated from business systems
🔴 IoT devices segmented from critical infrastructure
🟡 Intrusion detection/prevention enabled
🟡 GeoIP blocking configured for unnecessary regions

Network Segmentation

🔴 Configure VLANs for different traffic types (users, servers, guests, IoT)
🔴 Implement 802.1X authentication for device access
🔴 Deploy WPA3 wireless security with strong passwords
🟡 Enable network traffic monitoring
🟢 Document network topology and VLAN assignments

VPN and Remote Access

🔴 Deploy VPN with AES-256 encryption minimum
🔴 Require multi-factor authentication for all VPN access
🔴 Configure access policies based on user roles
🟡 Test VPN access from outside the network
🟡 Implement split tunneling policy (if applicable)

Phase 3: Server Hardening

Secure all server infrastructure before production deployment.

Operating System Security

Task	Priority	Applies To
Apply all security patches	🔴 Critical	All servers
Disable unnecessary services	🔴 Critical	All servers
Configure secure login policies	🔴 Critical	All servers
Enable audit logging	🔴 Critical	All servers
Install endpoint protection	🔴 Critical	All servers

Server Hardening Checklist

🔴 All security patches applied before production deployment
🔴 Unnecessary services and roles disabled
🔴 Strong password policy enforced
🔴 Account lockout policy configured
🔴 Audit logging enabled for security events
🔴 Endpoint protection installed and updated
🟡 Secure boot enabled (where supported)
🟡 Disk encryption enabled for sensitive data

Administrative Access

🔴 Create specific administrator accounts (no default admin use)
🔴 Configure sudo/UAC policies properly
🔴 Implement role-based access with minimum required permissions
🔴 Enable account lockout for failed admin login attempts
🟡 Implement privileged access management (PAM) solution
🟡 Require MFA for all administrative access

Logging and Monitoring

🔴 Configure system logging across all servers
🔴 Centralize logs to SIEM or log management system
🔴 Set up alerting for critical security events
🟡 Monitor for suspicious activities (failed logins, privilege escalation)
🟡 Test incident response procedures

Phase 4: Application & Database Protection

Secure all applications and databases before exposing to users.

Web Application Security

🔴 Enable HTTPS with valid TLS certificates (TLS 1.2+ only)
🔴 Configure web application firewall (WAF)
🔴 Implement input validation on all forms
🔴 Enable security headers (HSTS, CSP, X-Frame-Options)
🟡 Schedule regular vulnerability scanning
🟢 Implement content security policy

Database Security

Task	Priority	Verification
Change default passwords	🔴 Critical	No default credentials active
Configure strict access controls	🔴 Critical	Role-based access verified
Enable encryption at rest	🔴 Critical	Encryption status confirmed
Set up encrypted backups	🔴 Critical	Backup encryption verified
Configure audit logging	🟡 High	Database audit logs flowing

Database Checklist

🔴 All default passwords changed immediately
🔴 Database not directly accessible from internet
🔴 Strict access controls configured (principle of least privilege)
🔴 Encryption at rest enabled
🔴 Encrypted backups configured
🟡 Database audit logging enabled
🟡 Connection encryption required (TLS)

Email Security

🔴 Configure spam filtering and malware scanning
🔴 Enable DMARC, DKIM, and SPF records
🔴 Set up encryption for sensitive communications
🔴 Implement data loss prevention (DLP) policies
🔴 Configure reliable email backup/archival

Phase 5: Endpoint Security

Protect all user devices accessing company resources.

Workstation Security

🔴 Install endpoint protection (antivirus/EDR) on every workstation
🔴 Configure automatic security updates
🔴 Enable disk encryption (BitLocker/FileVault)
🔴 Set up automated backups
🔴 Configure user access controls (standard user, not admin)
🟡 Implement application whitelisting
🟡 Configure host-based firewall

Mobile Device Management (MDM)

🔴 Deploy MDM for all devices accessing company data
🔴 Require device encryption
🔴 Require lock screen with PIN/biometric
🔴 Enable remote wipe capability
🟡 Control application installation
🟡 Monitor device compliance

Phase 6: Identity & Access Management

Establish secure identity management from day one.

Authentication Configuration

Component	Requirement	Priority
Identity Provider	Properly configured (AD, Azure AD, Okta)	🔴 Critical
MFA	Enabled for all users	🔴 Critical
SSO	Implemented where possible	🟡 High
Password Policy	Meets security standards	🔴 Critical
PAM	Configured for admin accounts	🟡 High

Identity Checklist

🔴 Identity provider properly configured
🔴 Multi-factor authentication enabled for all users
🔴 Strong password policy implemented
🔴 Account lockout policy configured
🟡 Single sign-on (SSO) implemented
🟡 Privileged access management for admin accounts

User Provisioning

🔴 Create standard user templates for common roles
🔴 Implement least privilege access by default
🔴 Configure account lifecycle management
🟡 Document all user administration processes
🟡 Automate onboarding/offboarding where possible

Phase 7: Data Protection & Backup

Ensure data is encrypted and recoverable.

Backup Configuration

Requirement	Minimum Standard	Optimal
Backup Frequency	Daily	Hourly for critical data
Backup Verification	Weekly test	Daily automated verification
Backup Encryption	AES-256	AES-256 with separate key management
Offsite Storage	Weekly rotation	Real-time replication
Restore Testing	Quarterly	Monthly

Backup Checklist

🔴 Automated backup solution deployed
🔴 Backups running daily (minimum)
🔴 Backup verification configured
🔴 Backup encryption enabled
🔴 Offsite/cloud backup storage configured
🔴 Restore procedures documented and tested

Encryption

🔴 Encryption enabled for sensitive data at rest
🔴 Encryption enabled for data in transit (TLS 1.2+)
🟡 Key management procedures documented
🟡 Encryption policy documented with data locations

Phase 8: Ongoing Management

Security is not a project—it's a continuous process.

Maintenance Schedule

Activity	Frequency	Responsible Party
Vulnerability scans	Weekly	IT Security
Security reviews	Monthly	IT Management
Access audits	Quarterly	IT + HR
Penetration testing	Annually	External vendor
Backup restore testing	Quarterly	IT Operations
Policy review	Annually	IT + Legal
Security training	Annually	All staff

Ongoing Checklist

🔴 Weekly vulnerability scans scheduled
🔴 Monthly security review process established
🔴 Quarterly access audit process defined
🟡 Annual penetration testing contracted
🟡 Regular backup testing scheduled
🟡 Security documentation update process defined

Quick Reference: Implementation Timeline

Week	Focus Area	Critical Items
Pre-deployment	Planning	Risk assessment, policies, compliance requirements
Week 1	Core infrastructure	Firewall, network segmentation, server hardening
Week 2	Applications	Web apps, databases, email security
Week 3	Endpoints	Workstations, mobile devices, encryption
Week 4	Identity	Authentication, MFA, user provisioning
Ongoing	Maintenance	Scanning, audits, testing, documentation

Compliance Quick Reference

Regulation	Key Security Requirements
HIPAA	Encryption, access controls, audit logs, risk assessment
SOX	Access controls, change management, audit trails
PCI-DSS	Network segmentation, encryption, vulnerability management
CMMC	Access control, identification, incident response
NIST CSF	Identify, Protect, Detect, Respond, Recover

Key Takeaways

Getting security right from the start costs a fraction of what retrofitting after a breach does.

Principle	Action
Defense in Depth	Multiple security layers; no single point of failure
Least Privilege	Minimum access required for each role
Document Everything	Configuration, changes, and procedures
Test and Verify	Validate controls work before production
Continuous Improvement	Security is ongoing, not a one-time project

Initial Security Configuration