> Source: [sk109439](https://support.checkpoint.com/results/sk/sk109439)

# sk109439 - Endpoint Security Client not communicating with Endpoint Security Server after configuring it to work in authenticate mode

| Property | Value |
|----------|-------|
| Solution ID | sk109439 |
| Date Created | 2016-01-03 |
| Last Modified | 2017-06-12 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | Cloud, E89.X, E88.X, R82.10, R82, R81.20 |
| OS | Windows |

## Symptoms

- * After configuring the Endpoint Security Server to work in authenticate mode, newly installed Endpoint Security Clients are in disconnected mode, and fails to register to the Endpoint Server.

* cpda.log shows:

      
      ---ERROR--- Failed to send request/receive response due to HTTP curl library function curl_easy_perform returned error code 52 
      (== Server returned nothing (no headers, no data)). Last win error: 0 (0x0) (CHTTPCall_curl::sendReq_internal)
      ---ERROR--- Startup: Failed to register or update register endpoint. Last win error: 122 (0x7A) (CDA::doRegister)

## Cause

The installation package was exported before configuring the Endpoint Server to work in authenticate mode.

Since then, new clients cannot register to the server.

## Solution

This solution requires authentication. Please log in to view the full solution.

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