> Source: [sk174184](https://support.checkpoint.com/results/sk/sk174184)

# sk174184 - SSL error on access to Threat Prevention API (TPAPI) on port 18194

| Property | Value |
|----------|-------|
| Solution ID | sk174184 |
| Date Created | 2021-06-22 |
| Last Modified | 2021-06-23 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81 (EOS) |
| OS | Gaia |

## Symptoms

- * SSL error occurs when accessing the Threat Prevention API (TPAPI) as the Client and Security Gateway cannot agree on a specific cipher.

* Threat Prevention API SSL cipher suites used on port 18194 does not contain ECDHE ciphers.

* Changing or adding the relevant cipher suites with "cipher_util" as per article [sk126613](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk126613), does not resolve the issue.

## Cause

Threat Prevention API (TPAPI) SSL cipher suites used on port 18194 do not offer ECDHE ciphers.

## Solution

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

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