Remote Working
VPN Connected but Cannot Reach Your NAS or Office Devices? Check the Route
A connected VPN tunnel is only the first step. Separate route conflicts, name resolution and service permissions to find why office devices remain unreachable.
If the VPN connects but a NAS or office device will not open, check the destination route, local subnet and service access before replacing the router. Try one authorised service by its private IP address, then by name. An overlapping network or missing DNS route can leave the tunnel connected while the resource remains inaccessible.
The VPN indicator is green, ordinary websites work and the office file share still times out. Reconnecting ten times changes nothing. This is a different problem from a tunnel that never establishes.
Work through one known device and one known service. A network browser showing no printers is weaker evidence than a failed connection to the exact printer address and service you are authorised to use.
A Connected Tunnel Does Not Prove the Whole Path Works
| Check | What it establishes | What it does not establish |
|---|---|---|
| VPN status | The client reports an established tunnel | Every office subnet or service is reachable |
| Open a known private IP | The selected service responds along this path | The device name resolves correctly |
| Open the same service by name | Name resolution and the service path both work | All discovery broadcasts cross the VPN |
| Sign in to the resource | The account has suitable service access | Every folder or application is authorised |
Record the exact error. “Name not found”, a connection timeout and “access denied” point to different stages. Ping can be useful, but a host may block ICMP while its permitted application still works. Do not treat one unanswered ping as proof that the NAS is off.
Check Whether Both Ends Use the Same Private Subnet
A common travel problem is an office LAN using 192.168.1.0/24 and the café, hotel or home network using the same range. The client then has competing ideas about where a destination such as 192.168.1.50 lives. These are example addresses, not a suggested change to your own network.
Compare the client’s current local address and mask with the office destination subnet. Ask the administrator to inspect the route selected for that destination. A working tunnel cannot resolve an ambiguous address plan by itself.
One Tunnel, Two Different Address Plans
Example private ranges. Check the selected route before changing a live network.
01 Overlapping local and office LANs
Connected tunnel, ambiguous destinationThe client can try the local path for an address intended for the office.
02 A planned, distinct office range
Routes, return path and policy still matterDistinct ranges remove this overlap. DNS and authorised service access need their own checks.
If the address ranges overlap, a planned change to an appropriate unique subnet, or another supported routing design, may be needed. Changing an office LAN affects DHCP reservations, static devices, VLAN rules, DNS and saved connections. Back up the configuration and plan that work before applying it to a production site.
Use the Same Service to Separate IP Access from DNS
First confirm the private address with the resource owner. Then test the intended service by address, followed by its normal hostname. For a file server, use the approved share path. For a management page, use its authorised protocol and port. Keep credentials private.
If the address works and the name fails, investigate which DNS server the VPN client uses and whether it can reach that server. Check the required internal domain suffix too. A short device name that works inside the office may not resolve from a remote client.
A shared-device list can depend on local discovery rather than ordinary DNS. Its absence does not automatically mean routing is broken. Prefer a documented address or name for the task instead of enabling broad network discovery across security boundaries.
Check Routes, Return Traffic and the Allowed Service
For a split-tunnel VPN, the required office networks must be included in the client’s destination routes. The remote network also needs a valid return path to the VPN client network. Check the actual configuration rather than assuming that every private range is included.
If one office VLAN opens but another does not, compare their routing and firewall policies. If one laptop works and another fails, compare client routes, DNS, endpoint policy and the account used. These narrower comparisons are more useful than replacing a gateway immediately.
Review firewall logs and service permissions with the administrator. A host may allow its local LAN but not the VPN client subnet. Where access is intended, use a narrowly scoped rule for the required source, destination and service. Do not disable the firewall or expose SMB and remote desktop to the public internet as a workaround.
Match the Gateway, VPN Server and Travel Client Roles
The office gateway receiving remote connections and a travel router initiating a tunnel have different jobs. Confirm the supported protocol and role at each end, including the current firmware and account requirements.
An office-side gateway option. Check the selected VPN server, routes and access policy for the intended deployment.
A travel-side client option. A successful tunnel still depends on the destination network and its permissions.
UniFi offers distinct VPN server, client and site-to-site functions. Teleport is another supported remote-access approach on suitable equipment. Do not assume that a protocol supported in one role is available in every role on every model.
If the problem occurs only after an internet connection changes, the dual-WAN session and VPN guide covers that separate disruption. Keep it separate from a tunnel that stays connected but cannot reach a destination.
Leave with a Repeatable Remote-Access Check
- Record the client’s local subnet and the office destination subnet.
- Confirm the tunnel is established and identify the selected VPN role.
- Test one authorised service by private IP address.
- Repeat using its normal hostname.
- Inspect the chosen route, return path and relevant policy logs.
- Retest from another trusted connection without changing several settings at once.
When asking a Support Specialist for help, provide the two subnet ranges, destination service, error and which tests succeeded. Remove keys, passwords and personal information from screenshots. An exported router configuration contains more than is needed to explain most access problems.
The useful fix is the one that restores a defined service through the intended route. Resolve overlapping addresses, missing routes or DNS first. Upgrade hardware when a verified capability or capacity limit remains, rather than using a new router to hide an unresolved network design.
Frequently Asked Questions
Why does my VPN say connected when my NAS will not open?
Tunnel establishment and resource access are separate. Check destination routes, overlapping private networks, DNS, firewall rules and the NAS service permissions.
Can two networks both using 192.168.1.0/24 cause this?
Yes. Overlapping local and remote ranges can send traffic towards the wrong network. Have the administrator inspect the selected route and plan an appropriate address design.
Why does the NAS IP address work but its name does not?
That points towards name resolution or discovery. Check the internal DNS server, DNS reachability and required domain suffix while keeping the same destination service.
Does a failed ping prove the VPN is broken?
No. ICMP may be blocked. Test the authorised application or service as well, and compare its result with routing and firewall evidence.
Should I disable the firewall to test it?
Use logs and a suitably scoped rule with the administrator. Avoid blanket firewall disabling or public exposure of private file and remote-access services.
Will a travel router automatically fix office VPN access?
No. It can provide a supported client connection, but the office routes, address plan, DNS and permissions still have to support the intended resource.
