Secure Remote Access to AWS Resources from On-Premises

Source: Dev.to

Modern AWS architectures avoid exposing networks and instead focus on intent‑based access:

• Application access
• Administrative access
• Controlled network access

This reference architecture demonstrates three secure access patterns from on‑premises to AWS using:

• AWS Client VPN
• EC2 Instance Connect Endpoint
• AWS Verified Access

Each pattern serves a distinct purpose and should be used together—not interchangeably.

Architecture Context

The VPC contains:

• Private EC2 instances
• Private RDS databases
• Internal Application Load Balancer
• No public subnets for compute
• No inbound SSH or database ports

Remote users enter AWS only through explicit access services.

Flow 1: Application Access via AWS Verified Access

Use Case

Secure access to private web applications without VPN or public exposure.

Flow

Key Characteristics

• Identity‑based access
• No network‑level trust
• No VPC‑wide visibility
• No public ALB required

Flow 2: Administrative EC2 Access via EC2 Instance Connect Endpoint

Use Case

Secure SSH access to private EC2 instances without bastion hosts or public IPs.

Flow

Key Characteristics

• IAM‑based authentication
• Short‑lived access
• No inbound SSH rules
• Fully auditable

Flow 3: Network‑Level Access via AWS Client VPN

Use Case

Broad access to private AWS resources such as databases, internal APIs, or legacy tools.

Flow

Key Characteristics

• Encrypted tunnel
• Route‑based access
• Subnet‑level reachability
• Works well for legacy workflows

VPN vs Verified Access (When to Use What)

Comparison Table

Simple Rule of Thumb

• If users need a network → VPN
• If users need an app → Verified Access

Why These Services Work Best Together

This layered approach ensures:

• No over‑privileged access
• Clear separation of concerns
• Reduced blast radius
• Easier audits and compliance

Security Best Practices Highlighted

• No public EC2 or RDS instances
• No inbound SSH from on‑premises
• IAM‑driven access
• Explicit access entry points
• Multi‑AZ design

Final Thoughts

Secure remote access to AWS is not about choosing one tool. It’s about:

• Matching the access method to intent
• Avoiding unnecessary network exposure
• Enforcing identity at the entry point

By combining:

• AWS Verified Access
• EC2 Instance Connect Endpoint
• AWS Client VPN

you get a secure, scalable, and least‑privilege remote access model from on‑premises to AWS.