TerraMaster Forum

With the latest update to TOS 7.0.0500 my ability to remote access has gone.
When i try to start the function on TOS it issues a response of

Network connection error. TNAS.online is unavailable, out of both items to check 'network connection' and 'security isolation mode', these are not implemented on my system. So at a loss on why this service is not working.



Any suggestions.

ubdai66 wrote: ↑12 Jun 2026, 00:41

This problem is usually related to system configuration or network environment. It is recommended to troubleshoot item by item in the following order:

Whether "Security Isolation Mode" is enabled
If you need to use TNAS.online, please disable this mode first.

Whether system time is correct
Open TOS terminal and enter "date" to confirm

If the time is incorrect, please calibrate in:
Control Panel > General Settings > Region & Language > Time.

MikeZhang wrote: ↑12 Jun 2026, 07:38

ubdai66 wrote: ↑12 Jun 2026, 00:41

This problem is usually related to system configuration or network environment. It is recommended to troubleshoot item by item in the following order:

Whether "Security Isolation Mode" is enabled
If you need to use TNAS.online, please disable this mode first. This is turned off

Whether system time is correct
Open TOS terminal and enter "date" to confirm Date shows todays date and correct local time for the UK

If the time is incorrect, please calibrate in:
Control Panel > General Settings > Region & Language > Time.

Region and language are correct for the UK

ubdai66 wrote: ↑12 Jun 2026, 19:05

To further investigate the issue, please help us check and provide the following information:

First, please confirm whether your NAS can access the Internet properly. You can check the WAN connection status in the System Dashboard on the TOS desktop and verify whether it shows "Connected".

In addition, please confirm whether the following online services are functioning normally:

Whether applications can be downloaded and installed from the App Center.
Whether the system can successfully check for and obtain online updates.
Whether other Internet-dependent features are working as expected.

If the WAN connection status in the System Dashboard shows "Disconnected", please refer to the following forum post for troubleshooting steps:

viewtopic.php?t=5939

Once you have completed these checks, please let us know the results so that we can further analyze the cause of the TNAS.online issue.