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Question DEBIAN 8 > DEBIAN 9: Upgrade-Questions

omexlu

Regular Pleskian
Hello,

I am planning to upgrade my server from Debian 8 to Debian 9 and wanted to do it according to these instructions:

Is there anything special to consider here? Which mistakes could happen? I use Plesk Obsidian.

I have changed the SSH port and the firewall is blocking the default port, I guess it's better to disable the firewall before upgrading to avoid locking myself out of the system?

EDIT: Anyway i don't have this file (/opt/psa/bin/distupgrade.helper.deb8-deb9_post.x64.sh) on my system, is this created by other helpers after?

I would be grateful for any information.
 
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