After some months I relive this thread because I have some new info. Apparently, the new Addon Domain cannot be created because the Name Servers are not correctly pointed to the HelioHost Name Servers: this condition stops midway the Addon Domain creation process, but the cPanel does not reports any error about this. I contacted my domain registrar to ask why the NS are not changed to HelioHost, and it says that because the addon domain that I try to create is a ".it", the Italian Registrar Authority does more checks on Name Servers before authorizing the DNS change, i.e.: - There must be st least 2 NS - Both NS must be fully working - Cannot be any error on any NS during the check In detail, it seems that the Name Server ns2.heliohost.org does not responds correctly during the check:
<test name="NameserversResolvableTest" status="SUCCEEDED">
<nameserver name="ns1.heliohost.org." status="SUCCEEDED"/>
<nameserver name="ns2.heliohost.org." status="SUCCEEDED"/>
</test>
<test name="NameserversAnswerTest" status="FAILED">
<nameserver name="ns1.heliohost.org." status="SUCCEEDED"/>
<nameserver name="ns2.heliohost.org." status="FAILED">
<detail queryId="4">Nameserver test skipped for error in query: java.net.SocketTimeoutException</detail>
</nameserver>
</test>
See also the full report.xml attached. The problem does not seem temporary, because it persists from September. Can the root admin check for problems on this NS (and anso the cPanel lost error)? report.xml