Setting Up Remote Access Securely
Remote access lets staff reach business systems from elsewhere, and configured carelessly it exposes those systems to everyone.
The common mistake
Opening a service directly to the internet — remote desktop, a file server, a management interface — so it can be reached by anyone who finds it.
Automated scanning finds exposed services within hours, and credential-guessing attacks follow immediately.
This is the entry point in a large proportion of small business compromises, and it is entirely avoidable.
Better approaches
A VPN establishing an encrypted tunnel into the network, with access controlled at the VPN rather than by exposing individual services.
Cloud-hosted applications accessed over the web with proper authentication, which removes the need for network access entirely and is the simplest option for most small businesses.
Zero trust or identity-aware access services, which verify user and device for each request rather than granting broad network access.
For most small organisations, moving to cloud applications with strong authentication is simpler and safer than maintaining remote access to an office network.
Authentication
Multi-factor authentication on every remote access route, without exception. Credential theft is the dominant attack method and MFA defeats most of it.
Prefer authenticator apps or hardware keys over SMS codes, which are vulnerable to SIM swapping.
Unique passwords per service, managed in a password manager rather than reused.
Remove access promptly when someone leaves, which requires a documented offboarding process rather than memory.
Device security
Devices connecting remotely should be encrypted, patched and running current software.
Personal devices accessing business systems raise questions about what happens to data on them, which is worth addressing in a short written policy.
Screen locks with short timeouts, particularly for anyone working in public spaces.
Practical hygiene
Keep firmware on routers, firewalls and VPN appliances current. Vulnerabilities in these devices are actively exploited and patches are frequently not applied.
Change default credentials on every network device.
Limit access to what each person needs rather than granting broad access by default.
Log access and review it occasionally, since unusual login locations and times are the earliest sign of a compromised account.
Test that the arrangement actually works before it is needed urgently, since discovering the VPN is broken during a disruption is a poor time to find out.
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