SonicWall TZ350 end of life
TZ Series · also known as TZ 350, SonicWall TZ350, TZ350W
Status
Checked 30 Sep 2026TZ350 support ends on 1 Oct 2026. Budget and plan a replacement in the next 1 months.
- 1End of sale 15 Apr 2022 (4 years ago)
- 2End of software maintenance 16 Apr 2024 (2 years ago)
- 3Last date of support 1 Oct 2026 (today)
Key dates
Every date links to SonicWall's own page| Milestone | Date | Source |
|---|---|---|
| End of sale | 15 Apr 20224 years ago | Vendor bulletin ↗ |
| End of software maintenance | 16 Apr 20242 years ago | Vendor bulletin ↗ |
| End of vulnerability support | Not announced | – |
| Last date of support | 1 Oct 2026today | Vendor bulletin ↗ |
SonicWall terms mapped: Last Order Day = end of sale; Limited Retirement Mode begin = end of software maintenance (no further firmware updates or features, critical bugs and vulnerabilities only until End of Support); End of Support = last date of support. SonicWall publishes no separate end of vulnerability support date. Final 1-year support contract purchase date was 2025-09-30. Dates are the same for the wireless (W) variant.
What this means for your business
- Security patches stop when support ends, so the exposure starts on that date.
- Cyber insurance questionnaires increasingly ask whether any equipment is unsupported or past end of life.
- Vendor support for faults ends at the same time.
- This is general information, not legal or insurance advice.
Replacement options
Vendor-neutral options to consider:
- Fortinet FortiGate (entry range)
- Ubiquiti UniFi Cloud Gateway
- MikroTik RouterOS appliances
The right replacement depends on your sites, users and licensing, and is often cheaper than a like-for-like swap.
Keep or replace? Quick checklist
- Is it your internet-facing firewall?
- Do you have remote staff connecting through it?
- Is your cyber insurance renewal in the next 6 months?
- Do you store client or financial data behind it?
- Is it running old firmware, or does it have no active vendor licence?
Two or more “yes” answers on an unsupported or soon-to-be-unsupported device is a good reason to get advice.
Frequently asked questions
Is the TZ350 still safe to use?
For now, yes, but support ends soon. After that date SonicWall stops issuing security fixes, so plan a replacement before then.
What replaced the TZ350?
SonicWall's bulletin does not name a direct replacement that we've verified. The right choice depends on your sites, users and licensing.
Where do these dates come from?
From SonicWall's own lifecycle bulletins. Each date in the table links to its source, with the date we last checked it. Always confirm with SonicWall before making decisions.