> Source: [sk103271](https://support.checkpoint.com/results/sk/sk103271)

# sk103271 - IKEView Utility issues with HASH SHA-256 and DH group 20

| Property | Value |
|----------|-------|
| Solution ID | sk103271 |
| Date Created | 2014-11-06 |
| Last Modified | 2015-02-08 |
| Technical Level | Advanced |

## Symptoms

- * When using SHA-256, the IKEview tool doesn't recognize the hash algorithm.
* Error message: "Authentication Alg: Unknown Authentication Algorithm"
* DH group 20 is presented in IKEVIEW as Undefined Group Description.

## Solution

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