Hello everyone, I’ve met a strange problem with 4.8.3. I firstly built a DC using samba 4.8.3 in one linux, and I can create a domain ‘euler.huawei.com’ successfully. Then I try to install samba 4.8.3 in another linux mechine, and add it to the existed domain. It failed when I used the command ‘samba-tool domain join euler.huawei.com DC ‘ to join it to the domain. Here’s the log: euler-2:/usr/custom # samba-tool domain join euler.huawei.com DC --option='idmap_ldb:use rfc2307 = yes' -U vdsadmin at euler.huawei.com Finding a writeable DC for domain 'euler.huawei.com' Found DC euler-1.euler.huawei.com Password for [vdsadmin at euler.huawei.com]: workgroup is EULER realm is euler.huawei.com Adding CN=EULER-2,OU=Domain Controllers,DC=euler,DC=huawei,DC=com Adding CN=EULER-2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=euler,DC=huawei,DC=com Adding CN=NTDS Settings,CN=EULER-2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=euler,DC=huawei,DC=com Join failed - cleaning up Deleted CN=EULER-2,OU=Domain Controllers,DC=euler,DC=huawei,DC=com Deleted CN=EULER-2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=euler,DC=huawei,DC=com ERROR(runtime): uncaught exception - (3221225653, '{Device Timeout} The specified I/O operation on %hs was not completed before the time-out period expired.') File "/usr/lib64/python2.7/site-packages/samba/netcmd/__init__.py", line 176, in _run return self.run(*args, **kwargs) File "/usr/lib64/python2.7/site-packages/samba/netcmd/domain.py", line 706, in run plaintext_secrets=plaintext_secrets) File "/usr/lib64/python2.7/site-packages/samba/join.py", line 1482, in join_DC ctx.do_join() File "/usr/lib64/python2.7/site-packages/samba/join.py", line 1381, in do_join ctx.join_add_objects() File "/usr/lib64/python2.7/site-packages/samba/join.py", line 644, in join_add_objects ctx.join_add_ntdsdsa() File "/usr/lib64/python2.7/site-packages/samba/join.py", line 575, in join_add_ntdsdsa ctx.DsAddEntry([rec]) File "/usr/lib64/python2.7/site-packages/samba/join.py", line 470, in DsAddEntry ctx.drsuapi_connect() File "/usr/lib64/python2.7/site-packages/samba/join.py", line 448, in drsuapi_connect ctx.drsuapi = drsuapi.drsuapi(binding_string, ctx.lp, ctx.creds) The log is not like what is described in the samba wiki https://wiki.samba.org/index.php/Joining_a_Samba_DC_to_an_Existing_Active_Directory. Does any one know the reason and how to resolve it? Thanks. Ryan