> Source: [sk165794](https://support.checkpoint.com/results/sk/sk165794)

# sk165794 - VPN C2S gets disconnected in 1500 appliances when the encryption domain is configured manually

| Property | Value |
|----------|-------|
| Solution ID | sk165794 |
| Date Created | 2020-03-15 |
| Last Modified | 2022-07-20 |
| Technical Level | General |
| Products | Spark Firewall (Locally Managed) |
| Versions | R81.10.X |
| Platform | 1500, 1600, 1800 |

## Symptoms

- * VPN C2S gets disconnected when the encryption domain is configured manually.
* The connection drops after a few seconds.
* The logs show drops for port 18234 (the tunnel test packets).
* Changing the encryption domain to auto resolves the issue. <br />

## Solution

This problem was fixed. The fix is included in:

* [**Check Point R80.20.05**](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk164912 "Check Point R80.20.05")

Check Point recommends to always upgrade to the most recent version ([Check Point 1500 appliance](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&product=512 "Check Point 1500 appliance")).

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content