What is the first safe action for VPN Split-Tunnel DNS Mismatch (Internal Names Fail)?

- VPN is connected but internal hostnames do not resolve. - Internal resources work by IP but fail by DNS name. - Issue varies after reconnect or network changes.

Does VPN Split-Tunnel DNS Mismatch (Internal Names Fail) require administrator access?

This runbook includes steps that require administrator access and should be handled by IT support.

When should this issue be escalated?

- Multiple users on same VPN profile are affected. - Issue started after VPN profile or client updates. - Requested workaround bypasses managed security controls. Admin review or admin rights may be required for this step.

← Back to Corporate Tech Fixes

Designed for Enterprise IT Support & Corporate Environments

Networking

VPN Split-Tunnel DNS Mismatch (Internal Names Fail)

Troubleshoot split-tunnel VPN sessions where internal names fail while VPN appears connected. This troubleshooting guide is mirrored from the Support Portal knowledge base for quick access in Corporate Tech Fixes.

Severity: HighAdmin Required

Estimated Fix Time

10-20 min

Access Level

Admin Required

Total Steps

Author & Verification

Tamem J

IT Solutions Engineer

Last verified: March 3, 2026

Runbooks and troubleshooting guides are reviewed for enterprise-safe usage and avoid security bypass patterns.

Tested on Windows 11 23H2Tested on macOS Sequoia 15

Trust Signals

No ratings yet

0 total helpfulness votes

• Enterprise Microsoft 365 Administration
• Endpoint Management (Intune, Jamf, Kandji)
• Identity & Access (Entra ID, Okta)

#vpn#split-tunnel#dns#internal-names#networking#routing#support-kb#windows#macos

Note: “Download as PDF” opens the browser print dialog. Choose “Save as PDF” for a printable runbook copy.

Step-by-Step Resolution

Expand each section as needed

1
Symptoms
Info
Recommended validation or troubleshooting step
- VPN is connected but internal hostnames do not resolve. - Internal resources work by IP but fail by DNS name. - Issue varies after reconnect or network changes.
2
Likely Causes
Info
Recommended validation or troubleshooting step
- DNS servers/search suffixes not applied correctly via tunnel. - Local DNS overrides enterprise resolution path. - Split-tunnel route policy and DNS scope mismatch.
3
Confirm scope, user impact, and reproduction
Info
Recommended validation or troubleshooting step
Document whether the issue affects one user, multiple users, or multiple devices. Confirm exact error messages, recent changes (password reset, update, network change), and whether the same issue reproduces in web vs desktop workflows where applicable.
4
Validate prerequisites and application/session state
Info
Recommended validation or troubleshooting step
Confirm the user is signed in with the correct corporate account, system time is accurate, network/VPN connectivity is stable, and the application is not running in offline or limited mode.
5
Run safe diagnostics from the Commands section
Info
Recommended validation or troubleshooting step
Use the command snippets below to collect non-destructive diagnostics. Capture output in the ticket when escalation may be required. Avoid deleting profiles, cached credentials, or managed app data unless the runbook or admin approval explicitly allows it.
6
Apply safe remediation steps
Info
Recommended validation or troubleshooting step
- Capture DNS server/search suffix state while VPN is active. - Test internal resources by hostname and IP for comparison. - Reconnect VPN and compare route/DNS outputs. - Escalate for profile-level DNS/split-tunnel policy correction.
7
Escalate when access, policy, or security controls are involved
Warning
Review carefully before proceeding
- Multiple users on same VPN profile are affected. - Issue started after VPN profile or client updates. - Requested workaround bypasses managed security controls.
Admin review or admin rights may be required for this step.

Split-tunnel DNS diagnostics

Command

Includes a copyable command block

Command

# Windows
ipconfig /all
Resolve-DnsName intranet.company.local
route print
 
# macOS
scutil --dns
nslookup intranet.company.local
netstat -rn

9
When to Escalate to IT / Security
Warning
Review carefully before proceeding
- Multiple users on same VPN profile are affected. - Issue started after VPN profile or client updates. - Requested workaround bypasses managed security controls.