We have done migration from the old server. And now we have problem with DNS Zone editing. we have done file edit like posted below https://www.howtoforge.com/community/threads/problems-after-upgrading-to-3-1.74075/#post-348462 But nothing. Please advise, you can check in attached screen.
1) Undo the file editing. 2) If you don't want to use the domain module in ISPConfig, then simply deactivate it under System > Interface > Main config.
I have new installed ISPConfig 3.1.8p1 on Ubuntu 16.04 LTS and Migration was done using ISPConfig Migration tool from old servet to new
2) If you don't want to use the domain module in ISPConfig, then simply deactivate it under System > Interface > Main config. or add the domain to the domain-module