> Source: [sk137772](https://support.checkpoint.com/results/sk/sk137772)

# sk137772 - Issue with loopback interfaces on R80.20 Management 

| Property | Value |
|----------|-------|
| Solution ID | sk137772 |
| Date Created | 2018-10-09 |
| Last Modified | 2022-03-28 |
| Technical Level | General |
| Products | Security Management Server, Multi-Domain Security Management Server |
| Versions | R82.10, R82, R81.20, R82.10, R82.20, R81.20, R82, R82.20 |
| OS | Gaia |

## Symptoms

- * Issue currently only seen on R80.20 M1 and R80.20 GA management. Issue is not present on R80.20 gateways.
* Not able to see new loopback interfaces from expert mode, but are able to add/edit/see in clish
* Only able to edit and modify the loopback interface only via clish shell, but unable to remove the interface.
* Licenses that have been created to use the loopback address (other then the default), no longer work but thou the licenses are present when running "cplic print".

## Solution

This issue was introduced in R80.20M1 with the new 3.10 kernel, also affecting R80.30 when using kernel 3.10.

This problem was fixed. The fix is included starting from:

* [Check Point R80.40](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk160736&partition=Basic&product=All)

Check Point recommends to always upgrade to the most recent version ([Security Management Server](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=downloads&product=184) / [Multi-Domain Security Management Server](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=downloads&product=166) / [SmartConsole](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=downloads&product=191)).

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