Executive Summary
When SonicWall accelerated the end-of-support timeline for its SMA 100 series, organizations were left with a narrow window to replace a critical component of their remote access infrastructure.
This created immediate risk.
Without a stable and secure replacement, businesses faced potential disruption to operations, exposure to security vulnerabilities, and uncertainty around long-term support.
STF Consulting led a structured transition to OpenVPN, designing and deploying a standardized remote access solution across multiple client environments. The result was a more secure, more predictable system built for long-term stability.
The Challenge
Many organizations relied on SonicWall SMA devices for secure remote access. When support timelines were shortened, the situation shifted from a planned migration to an urgent operational risk.
Key challenges included:
- Limited time to design and deploy a replacement solution
- Maintaining uninterrupted access for end users
- Ensuring secure authentication and compliance alignment
- Supporting a range of user types with different access requirements
- Avoiding disruption during transition
This was not just a product replacement. It required a structured approach to rebuild remote access in a way that reduced long-term risk.
Our Approach
At STF Consulting, we do not implement one-off fixes. We design structured environments that can scale, adapt, and remain stable over time.
This transition followed a defined process:
Phase 1: Assessment and Preparation
Before any deployment, we focused on understanding how remote access was being used across each client environment.
This included:
- Identifying active users and eliminating outdated access
- Determining authentication methods best suited for each client (LDAPS vs SAML)
- Understanding how different user groups accessed systems and resources
This step ensured the new environment would be clean, secure, and aligned with actual business needs, not legacy configurations.
Phase 2: Proof of Concept
We built and validated a standardized OpenVPN environment before broad deployment.
Core Infrastructure Setup
- Deployment of OpenVPN virtual appliance in VMware
- Secure credential configuration and hardened access via SSH
- Time synchronization (NTP) and timezone standardization to support authentication systems
- TLS 1.2 enforced as the minimum encryption standard to ensure modern security compliance
- Public FQDN configuration and DNS alignment
- Automated SSL certificate management using Let’s Encrypt
This created a secure, repeatable foundation for all future deployments.
Authentication and Security Design
We implemented LDAPS-based authentication as part of a zero trust approach.
This included:
- Domain controller configuration for secure directory authentication
- Certificate creation and deployment via Group Policy
- Dedicated LDAP bind account with controlled permissions
- Integration of authentication services into the OpenVPN platform
- Group-based access controls to enforce least privilege
Instead of broad access, users were granted only what they required.
Monitoring and Visibility
To maintain operational control and visibility:
- SNMP and syslog were configured and integrated into our RMM platform
- Systems were fully monitored for performance, access, and security events
- Backups were implemented using Veeam Backup & Replication
This ensured the environment was not only functional, but observable and maintainable.
Phase 3: Testing and Validation
Before deployment, we validated how the system behaved under real-world conditions.
Access Control Testing
- Administrators with full access
- Power users with access to multiple systems
- Restricted users with limited access (such as terminal servers only)
OpenVPN’s default-deny model allowed us to enforce true zero trust access. If access was not explicitly defined, it did not exist.
Deployment Standardization
We leveraged our RMM platform to:
- Deploy OpenVPN clients across environments
- Apply standardized configurations
- Ensure consistency across all users and systems
Each client environment used a dedicated installer tied to its specific configuration, reducing risk and improving reliability.
Session Optimization
We adjusted session timeouts to align with real-world usage.
- Default: 24 hours
- Adjusted: 7 days
This reduced user disruption while maintaining secure session control.
Phase 4: Deployment
Because of the structured preparation and testing, the go-live phase was controlled and predictable.
- Clients were pre-configured
- Users were validated before cutover
- Access was confirmed prior to transition
The result was a smooth migration with minimal disruption to operations.
Lessons Learned
Even with a structured approach, real-world environments introduce complexity.
Key insights included:
1. Policy Changes Require Careful Planning
Changes to network access policies triggered reconnections for affected users.
To minimize disruption:
- We implemented group-based policies instead of global changes
- Adjustments could be applied to smaller user sets without impacting entire organizations
2. Network Overlap Can Disrupt Connectivity
Some users had home networks that conflicted with corporate subnets.
We implemented subnet masking policies to resolve this:
- Translated overlapping IP ranges into alternate subnets
- Maintained seamless access without requiring user-side changes
These changes were deployed carefully, often after hours, to avoid operational impact.
3. Vendor Support Matters
OpenVPN’s support team played a critical role in resolving complex scenarios quickly.
Access to responsive, knowledgeable support reinforced the long-term viability of the platform.
The Outcome
By transitioning to OpenVPN, STF Consulting delivered:
- A standardized remote access platform across client environments
- Improved security through zero trust access controls
- Reduced risk from unsupported legacy systems
- Greater visibility and monitoring across all deployments
- A scalable solution aligned with long-term IT strategy
Most importantly, clients gained a stable, predictable system that supports their operations without ongoing disruption.
Final Thought
This project reflects a broader principle:
Reliable IT is not built through quick fixes. It is built through structure, standardization, and a long-term approach.
At STF Consulting, that is how we design every environment.
Call to Action
If your remote access or security infrastructure is built on aging or inconsistent systems, now is the time to address it.
Schedule a consultation with STF Consulting to evaluate your environment and identify areas of risk before they impact your business.