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Internet loss for 60 seconds or less - several times a day on TZ400

paullafpaullaf Newbie ✭
edited November 18 in Mid Range Firewalls

Hi all,

I'm a long time user of Sonicwall Appliances and very familiar with most versions of the OS.

In recent months, I've had to replace a TZ400 and a TZ370 due to frequent internet drops of 30 seconds to a minute. When these drops occurred, link was not lost to the ISP's modem/router (according to the SW log) and no equipment had to be restarted to get the connection to come back. This was happening multiple times a day. I replaced the firewall with a new Sonicwall and the problem went away.

Now I've got another client with a TZ400 that is doing the same thing. I just patched to SonicOS Enhanced 6.5.4.15-117n which is the latest version offered at the time of this posting.

The problem persists even with this latest version. I did replace the cable between the sonicwall and ISP but the problem continues 1 to 5 times a day at random times; not even at peak load times.

Has anyone seen this issue?

Here are a few other facts about the environment:

  1. ISP is fiber running at 100mb by 100mb.
  2. IP Address is static
  3. There are no remote sites connected via VPN
  4. There are occasional VPN users
  5. There are about 30 users on the LAN
  6. There are no vLANs on the network
  7. There is no other internet connection attached to the Sonicwall. Just the Primary WAN.
  8. The TZ400 is under support till about February 2026
  9. Content Filtering Services are the only other licensed services on this device.

Any advice would be appreciated.

Thank you,

Paul

Category: Mid Range Firewalls
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Answers

  • blueblue Newbie ✭
    is this on the same pc or multiple pc's? hardwired, Wi-Fi? are the VPN users losing internet or local, both?
  • paullafpaullaf Newbie ✭

    It's all computers. All computers get their connection through the sonicwall and all lose the Internet for <60 seconds. It says "no internet" on their Windows PCs. Computers are hardwired to an unmanged netgear switch. VPN is not heavily use so I can't be sure about that. The LAN users can still get to internal resources which tells me it is either the SW or the Internet connection.

  • ArkwrightArkwright Community Legend ✭✭✭✭✭

    Configure Failover and Load Balancing with logical probing on the WAN(s). It will log the state of connectivity to the probe target and keep some [limited] statistics.

  • paullafpaullaf Newbie ✭

    That's a good suggestion @Arkwright I'll give that a shot.

    Thank you,

    Paul

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