Fix SonicWall TZ300 Boot Loop Causing Network Outage

draft · network sonicwalldhcpstatic-ipboot-loop

Generated by docuprocessor (prompt article/v3) · 2026-04-22 15:46

Source thread

thread_id: spaces/AAAA05BdS6s/threads/MU9qiOUYEuA · 13 msgs · first 2025-02-10 · participants: Tech ATech BTech C

Tech A 2025-02-10 14:41

Hey guys, is anyone familiar with Upper east dental associates? They do not have internet at the office. We found that the Sonicwall TZ300 that they have, turn on the lights, and after few seconds turn them off, on loop. We will need to go there to check that, besides that, they are not able to use dentrix. Does someone knows if they use dentrix ascend?

Tech B 2025-02-10 14:42

SHARDE HARVEY?

Tech B 2025-02-10 14:43

(no text)

image/png image.png

The image displays a software inventory or installation list with four entries, each labeled **"Name:"** in blue text on a white/gray background. The listed software components are: **Dental HT Agent version 1.1**, **Dentrix G7.4**, **Dentrix Smart Image 2.5**, and **Dentrix Smart Image DEXIS Connector 2.5**. All entries appear in orange/amber text with no error codes, status indicators, or additional metadata visible.

Tech C 2025-02-10 14:43

it's Mansoor, they use dentrix core

Tech A 2025-02-10 14:43

MANSOOR 60TH, I just checked they use dentrix core

Tech A 2025-02-10 14:43

yes

Tech B 2025-02-10 14:46

last time they've had a battery backup issue and I believe we replaced it not long ago

Tech A 2025-02-10 14:47

Now they are having that issue with the sonicwall :/ I'm asking rebecca to restart the switch again, maybe they are able to use dentrix at least

Tech B 2025-02-10 14:48

unless you setup static IP on all PCs, router is a must

Tech A 2025-02-10 15:22

They called the "it guy of the building" and they are telling me that they have 2 sonic walls running at their building. That they can provide us with a DHCP if we bypass the sonicwall

Tech B 2025-02-10 16:06

... and expose the network to all the businesses at that building. HIPAA be like:

Tech A 2025-02-10 16:06

I know

Tech A 2025-02-10 16:06

Daniel is calling them for a new wg

---
title: "Fix SonicWall TZ300 Boot Loop Causing Network Outage"
category: network
tags: ["sonicwall", "dhcp", "static-ip", "boot-loop"]
source_thread_id: "spaces/AAAA05BdS6s/threads/MU9qiOUYEuA"
source_space: "spaces/AAAA05BdS6s"
generated_at: "2026-04-22T15:46:03"
participants: ["Tech A", "Tech B", "Tech C"]
---

# Fix SonicWall TZ300 Boot Loop Causing Network Outage

## Problem
A dental office experienced complete network outage preventing access to Dentrix Core. The SonicWall TZ300 firewall was stuck in a boot loop - powering on for a few seconds, then turning off, and repeating continuously. This left the office without internet connectivity and unable to access their practice management system.

The building's IT support offered to bypass the SonicWall and provide DHCP from their shared network infrastructure, but this would expose the dental practice's network to other businesses in the building, creating HIPAA compliance issues.

## Resolution
1. **Do not accept shared building DHCP** - This exposes the practice network to other tenants and violates HIPAA requirements for network isolation
2. **Replace the failed SonicWall** - Contact vendor for new WatchGuard unit replacement
3. **If temporary connectivity is needed before replacement arrives:**
   - Configure static IP addresses on all workstations
   - This allows local network communication for Dentrix Core without requiring DHCP from the router
4. **Verify power supply and UPS** - Previous issues at this location involved battery backup problems that may have contributed to hardware failure

The office was scheduled for a new WatchGuard firewall replacement to restore proper network security and DHCP services.

## References
- Source discussion: `spaces/AAAA05BdS6s/threads/MU9qiOUYEuA`
- Attachments: - ![image.png](../attachments/MU9qiOUYEuA.QHtiU_R0xII/image.png) — The image displays a software inventory or installation list with four entries, each labeled **"Name:"** in blue text on a white/gray background. The listed software components are: **Dental HT Agent version 1.1**, **Dentrix G7.4**, **Dentrix Smart Image 2.5**, and **Dentrix Smart Image DEXIS Connector 2.5**. All entries appear in orange/amber text with no error codes, status indicators, or additional metadata visible.

Generated article

draft