[Samba] port 135 - NT_STATUS_CONNECTION_REFUSED

[Bob of Donelson Trophy]

On 2016-12-04 09:11, Rowland Penny via samba wrote:

> On Sun, 04 Dec 2016 08:01:09 -0600
> Bob of Donelson Trophy via samba <samba at lists.samba.org> wrote:
> 
>> I have two DC's running Samba 4.5.0 and the "dtdc03" log.samba is
>> showing the following: 
>> 
>> root at dtdc03:~# tail -f /usr/local/samba/var/log.samba
>> [2016/12/01 10:14:39.167794,  0]
>> ../source4/librpc/rpc/dcerpc_sock.c:245(continue_ip_open_socket)
>> Failed to connect host 192.168.16.50
>> (aa03011a-94c2-4c52-bc60-6fd2f75d35e5._msdcs.dtshrm.dt) on port 135 -
>> NT_STATUS_CONNECTION_REFUSED.
>> [2016/12/01 10:14:39.212551,  0]
>> ../source4/librpc/rpc/dcerpc_sock.c:63(continue_socket_connect)
>> Failed to connect host 192.168.16.50 on port 135 -
>> NT_STATUS_CONNECTION_REFUSED
>> [2016/12/01 10:14:39.212757,  0]
>> ../source4/librpc/rpc/dcerpc_sock.c:245(continue_ip_open_socket)
>> Failed to connect host 192.168.16.50
>> (aa03011a-94c2-4c52-bc60-6fd2f75d35e5._msdcs.dtshrm.dt) on port 135 -
>> NT_STATUS_CONNECTION_REFUSED.
>> [2016/12/01 10:14:39.258017,  0]
>> ../source4/librpc/rpc/dcerpc_sock.c:63(continue_socket_connect)
>> Failed to connect host 192.168.16.50 on port 135 -
>> NT_STATUS_CONNECTION_REFUSED
>> [2016/12/01 10:14:39.258234,  0]
>> ../source4/librpc/rpc/dcerpc_sock.c:245(continue_ip_open_socket)
>> Failed to connect host 192.168.16.50
>> (aa03011a-94c2-4c52-bc60-6fd2f75d35e5._msdcs.dtshrm.dt) on port 135 -
>> NT_STATUS_CONNECTION_REFUSED. 
>> 
>> So, I found the "Verifying_and_Creating_a_DC_DNS_Record" page of the
>> wiki and ran: 
>> 
>> root at dtdc03:~# ldbsearch -H /usr/local/samba/private/sam.ldb
>> '(invocationId=*)' --cross-ncs objectguid
>> # record 1
>> dn: CN=NTDS
>> Settings,CN=DTDC03,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=dtshrm,DC=dt
>> objectGUID: d3298cdc-aed1-48e6-b8fc-f3cdb80b1066
>> 
>> # record 2
>> dn: CN=NTDS
>> Settings,CN=DTDC04,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=dtshrm,DC=dt
>> objectGUID: aa03011a-94c2-4c52-bc60-6fd2f75d35e5
>> 
>> # returned 2 records
>> # 2 entries
>> # 0 referrals 
>> 
>> And then ran: 
>> 
>> root at dtdc03:~# host -t CNAME
>> aa03011a-94c2-4c52-bc60-6fd2f75d35e5._msdcs.dtshrm.dt.
>> aa03011a-94c2-4c52-bc60-6fd2f75d35e5._msdcs.dtshrm.dt is an alias for
>> dtdc04.dtshrm.dt. 
>> 
>> The objectGUID string matches. How do I correct this log entry and
>> resolve the "NT_STATUS_CONNECTION_REFUSED?
> 
> OK, is your DC listening on port 135 ?
> Run this on the DC:
> 
> netstat -plnt | grep 135
> 
> It should return something like this:
> 
> tcp        0      0 0.0.0.0:135             0.0.0.0:*               LISTEN      2093/samba      
> tcp6       0      0 :::135                  :::*                    LISTEN      2093/samba      
> 
> What is the 'server services' line in smb.conf ?
> 
> Rowland

Here is the output from "netstat -plnt | grep 135": 

root at dtdc03:~# netstat -plnt | grep 135
tcp        0      0 192.168.16.49:135       0.0.0.0:*              
LISTEN      1142/samba      
tcp        0      0 127.0.0.1:135           0.0.0.0:*              
LISTEN      1142/samba 

Here are both DC's smb.conf files: 

root at dtdc03:~# cat /etc/samba/smb.conf
# Global parameters
[global]
    netbios name = DTDC03
    realm = DTSHRM.DT
    server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl,
winbindd, ntp_signd, kcc, dnsupdate
    workgroup = DTDOM
    server role = active directory domain controller

    time server = yes

##    log level = 5

    interfaces = 127.0.0.1    192.168.16.49
    bind interfaces only = yes

    allow dns updates = nonsecure and secure 
        dns forwarder = 192.168.16.49

        # Thanks to Lars for this fix, it stops the syslog
        # being spammed by the lack of a CUPS server.
        printing = CUPS
        printcap name = /dev/null

[netlogon]
    path = /usr/local/samba/var/locks/sysvol/dtshrm.dt/scripts
    read only = No

[sysvol]
    path = /usr/local/samba/var/locks/sysvol
    read only = No 

root at dtdc04:~# cat /etc/samba/smb.conf
# Global parameters
[global]
netbios name = DTDC04
realm = DTSHRM.DT
server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl,
winbindd, ntp_signd, kcc, dnsupdate
workgroup = DTDOM
server role = active directory domain controller 

time server = yes 

### log level = 5 

interfaces = 127.0.0.1 192.168.16.50
bind interfaces only = yes 

allow dns updates = nonsecure and secure 
dns forwarder = 192.168.16.50

# Thanks to Lars for this fix, it stops the syslog
# being spammed by the lack of a CUPS server.
printing = CUPS
printcap name = /dev/null 

[netlogon]
path = /usr/local/samba/var/locks/sysvol/dtshrm.dt/scripts
read only = No 

[sysvol]
path = /usr/local/samba/var/locks/sysvol
read only = No 

Your thoughts?

-- 
_______________________________

Bob Wooden of Donelson Trophy