Sonicwall goes offline but still working TZ500
Starts happening 2 months ago. The 1st symptom is VPN connection to another Sonicwall is not working (VPN Tunnel). Then access to Sonicwall over the browser is not working, and Can't ping gateway or SonicWall (same IP). RDPs on the site can be used only internally. The internet is working as normal, users don't notice unless they use RDP to another site or WFH and use RDP+NetExtender. The users on site can use the same LAN RDPs.
Quick fix: restart, then I have 3 to 5 days before it will happen again. Sonicwall support asked me to update to the latest OS, which I did last week. We have 3 identical TZ500 and it's the only one that acts like that.
We have licences for 24/7 support, Software n Firmware Updates, and Hardware Warranty.
The support from SonicWall cant help. he remoted twice, every time he just clicked on random settings for an hour and that's it. No help here.
Enable SSH on an internal interface and when things start getting weird see if you can still get in that way. Not surprised support hasn't helped, did they even send you this?
Connect a console cable and gather the output.
Unfortunately it is now up to you to do the in-depth troubleshooting.
CLI is not responding too. The device is doing this every day. Sonicwall agreed to send a new firewall.