> Source: [sk111816](https://support.checkpoint.com/results/sk/sk111816)

# sk111816 - "Permission denied" error when RADIUS / TACACS+ user tries to login to Expert mode on Gaia OS

| Property | Value |
|----------|-------|
| Solution ID | sk111816 |
| Date Created | 2016-06-09 |
| Last Modified | 2017-05-21 |
| Technical Level | Advanced |
| Products | Security Gateway, Security Management Server, Multi-Domain Security Management Server |
| Versions | R82.10, R82, R81.20, R82.10, R82, R81.20, R82.10, R82.20, R81.20, R82, R82.20 |
| OS | Gaia |

## Symptoms

- "`Permission denied`" error when RADIUS / TACACS+ user tries to login to Expert mode on Gaia OS, although this RADIUS / TACACS+ user role is defined with UID 0 and group 0.

Example:  

`/opt/CPcvpn-R77/scripts/CVPNprofile.sh: Permission denied`

## Cause

The username of RADIUS / TACACS+ user is identical to an existing local username defined on Gaia OS.

Such configuration is not supported (quote from [R77 Gaia Administration Guide](http://supportcontent.checkpoint.com/documentation_download?id=24828) - Chapter "User Management":  
"`Do not define a new user for external users. An external user is one that is defined on an authentication server (such as RADIUS or TACACS) and not on the local Gaia system.`").

## Solution

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

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