> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gcore.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshoot errors with ISO image installation

DCI manager handles ISO images for dedicated servers under **Templates** > **ISO-images**. Upload and mounting errors appear during the [ISO installation](/hosting/dedicated-servers/manage/operating-system/install-a-linux-os-from-your-iso-image) process when the file doesn't meet format or size requirements, or when the IPMI proxy fails to attach the image.

## Upload failure

If the ISO image upload fails, check that the file meets all requirements:

* The file extension must be lowercase: `.iso`, not `.ISO`. Use only letters and numbers in the filename.
* The file size must not exceed 9 GB.
* No more than four ISO images are allowed per account.
* ISO images are automatically deleted after 24 hours.

If the upload still fails, delete the failed image and try again. DCI manager shows a **Delete the ISO-image** button in the error dialog.

## Mounting error

If DCI manager shows the following error when mounting an ISO image on a server:

```
Error occurred when mounting ISO-image on the IPMI proxy server. Script output: ''
```

Delete the ISO image and upload it again. If the error persists, [contact support](/hosting/contact-our-technical-support).