How to solve RPC server is unavailable error when replicating domains?

Question

linux

Hello colleagues!
There is a domain controller on Windows Server 2012R2. I want to raise another controller on Ubuntu with samba4 on board. I do everything according to the manual
https://wiki.samba.org/index.php/Joining_a_Samba_D...
But when I try to register as a DC, I get an error. Failed to commit objects: WERR_GEN_FAILURE

First samba-tool domain join my.domain DC -U"MYDOMAIN\admin" --dns-backend=BIND9_DLZ threw this error. On the domain controller, I found the error "8524 The DSA operation is unable to proceed because of a DNS lookup failure."
Cured via samba-tool dns add MYPDC my.domain samba-dc A 10.1.1.15 -U"MYDOMAIN\admin"
Now the error is "1722 The RPC server is unavailable."
I don't understand how to overcome this error. Maybe some packages to deliver? Maybe the domain controller needs additional manipulations?
Installed the following packages apt update && apt full-upgrade -y && apt install -y samba winbind libpam-winbind libnss-winbind libpam-krb5 krb5-config krb5-user krb5-kdc bind9 acl dnsutils ntp ntpdate

Answer 1

Disabling or configuring the Firewall on the domain controller may help. There, by default, the rules for RPC are disabled.