Forgot to mention these details earlier. 

OS : CentOS 6.9

Samba: samba-3.6.23-43.el6_9.x86_64

Thanks,

~ abhi


Sent from my iPhone

> On Jun 12, 2017, at 3:30 PM, Abhijit Tikekar <[email protected]> wrote:
> 
>  
> Hi,
>  
> We recently started facing this error on all new servers that need to be 
> integrated with AD using SSSD. Every time “net ads join -k” command is 
> issued, following error is returned:
> “Failed to join domain: failed to lookup DC info for domain X.Y.LOCAL' over 
> rpc: NT_STATUS_CONNECTION_RESET”. [ In the packet capture, we do see reset’s 
> coming from DC]
>  
> This is also happening on servers already connected with AD. Same error, 
> although since they already have established join, authentication continues 
> to work. Also, noticed that after doing “net ads keytab create”, keytab file 
> is no longer getting generated under /etc.
>  
> AD team has recently disabled SMB V1 completely on the domain controllers. 
> Could that be somehow causing this? I tried setting “client max protocol = 
> SMB3” in smb.conf but that didn’t help.
> [ for " net ads keytab add" or " net ads keytab create"  it  now says:
> Ignoring unknown parameter "client max protocol"]
> 
>  
> How can I further troubleshoot this issue?
>  
>  
> Thanks,
> 
> ~ abhi
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