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# Common errors and troubleshooting
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## Recommendation
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If you think you have a problem with your XOA, start by typing`xoa check` command in your terminal:
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```
$ xoa check
✔ Node version
✔ Disk space for /var
✔ Disk space for /
✔ XOA version
✔ xo-server config syntax
✔ Appliance registration
✔ Internet connectivity
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```
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If the result you have is completely different from that, or if error messages are displayed, lost packets, etc., you have, indeed, a problem. The next step should be to check in this document if there is an existing troubleshooting for the problem you have.
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> You can also access the log by using this command: `$ tail -f /var/log/syslog` ([learn more](https://xen-orchestra.com/docs/logs.html))
## General
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- [Empty page after login ](https://xen-orchestra.com/docs/troubleshooting.html#empty-page-after-login )
- [Can't migrate XOA ](https://xen-orchestra.com/docs/troubleshooting.html#xoa-migration-issues )
- [Can't boot XOA ](https://xen-orchestra.com/docs/troubleshooting.html#xoa-boot-issues )
- [Network issues ](https://xen-orchestra.com/docs/troubleshooting.html#network-issues )
- [Out of memory ](https://xen-orchestra.com/docs/troubleshooting.html#memory )
- [Transparent proxy and updater ](https://xen-orchestra.com/docs/troubleshooting.html#behind-a-transparent-proxy )
- [SSL self-signed certificate expired ](https://xen-orchestra.com/docs/troubleshooting.html#updating-ssl-self-signed-certificate )
- [User authentication ](https://xen-orchestra.com/docs/authentication.html#debugging )
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## Backup troubleshooting
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- [Unhealthy VDI chain ](https://xen-orchestra.com/docs/backup_troubleshooting.html#unhealthy-vdi-chain )
- [SR_backend_failure_44 ](https://xen-orchestra.com/docs/backup_troubleshooting.html#srbackendfailure44-insufficient-space )
- [Could not find the base VM ](https://xen-orchestra.com/docs/backup_troubleshooting.html#could-not-find-the-base-vm )
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## You haven't found a solution here?
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Open a ticket concerning your issue on your personal space [here ](https://xen-orchestra.com/#!/member/support )
