> Source: [sk176932](https://support.checkpoint.com/results/sk/sk176932)

# sk176932 - SNX fails to connect after replacing the Mobile Access certificate

| Property | Value |
|----------|-------|
| Solution ID | sk176932 |
| Date Created | 2021-12-14 |
| Last Modified | 2025-08-25 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81.20, R81.10 (EOS), R81 (EOS) |

## Symptoms

- * On the client side of an SNX connection, SNX fails after users click **approve** with error message: "`Error - Cannot establish connection to SSL network extender gateway, try to reconnect.`"
* The SNX failure occurs after an administrator changed the certificate for Mobile Access Blade. Mobile Access Blade is configured to use FQDN.
* This output appears in the slimscv.log file:

  ```
  [slim_utils] RaisDbGetValue: Successfully read (REG_SZ) key -Fingerprint- with value [new gateway fingerprint]
  [verify_CN] lookup_gw: Fingerprints match [new gateway fingerprint]
  [ssl_tunnel] ssl_link_fwasync_client_handler: (termination code #303) Gateway was successfully verified by the user. Proceeding with connect...
  [ssl_tunnel] ssl_link_fwasync_client_handler: server_fingerprint_for_verification = [old gateway fingerprint] does not match gw_fingerprint = [new gateway fingerprint]
  ```

* vpn.elg log might show:

  ```
  [vpnd 18980 4074596288]@fw11[3 Apr 15:56:15][CPTLS] cptls_hs_print_alert: alert level: CPTLS_fatal, description: unknown_ca(48).
  ```

## Cause

There is a race condition between two `vpnd reconf `events.

## Solution

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

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