> Source: [sk184373](https://support.checkpoint.com/results/sk/sk184373)

# sk184373 - Kerberos SSO sessions terminate immediately after a login via Captive Portal after upgrade to R82

| Property | Value |
|----------|-------|
| Solution ID | sk184373 |
| Date Created | 2025-12-18 |
| Last Modified | 2026-09-10 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R82 |
| OS | Gaia |

## Symptoms

- * After upgrading Security Gateways to R82, each Kerberos Single Sign-On (SSO) authentication through the Captive Portal appears as **Successful Login (Kerberos)**, but the session terminates within 1-2 seconds.

* SmartConsole shows this log from the Security Gateway for the failed SSO authentication:

  `User Logout: A secondary session request was received from the same IP. This caused logout of the current session.`
* Debug of the Captive Portal ([sk102986](https://support.checkpoint.com/results/sk/sk102986)) shows this exception in the `/opt/CPNacPortal/logs/NacPortal.log` file:

  `
  Description: curl_error(): supplied resource is not a valid cURL handle resource`  
  `
  Error Number: XXX`  
  `
  File: /opt/CPNacPortal/phpincs/web/actions/SendSessionIdnAction.php (line XXX)
  `
* Reverting the Security Gateway to R81.20 restores normal Kerberos SSO functionality.

## Solution

This problem was fixed. The fix is included in:

* [Jumbo Hotfix Accumulator for R82](https://sc1.checkpoint.com/documents/Jumbo_HFA/R82/Default.htm) starting from Take 126

If you choose not to upgrade, Check Point can supply a **Hotfix** . [Contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for this issue.  
A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.  
For faster resolution and verification, please collect [CPinfo files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

**Hotfix installation instructions:**   
Refer to [sk168597 - How to install a Hotfix](https://support.checkpoint.com/results/sk/sk168597).

---

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