It's been a while since I used SAMBA to access network shares. It was working fine in 19.xx, but I think it may be broken in 20.04 and 20.10 (I'm using 20.10).
I can't access the shares on my own local computer, although I seem to be able to access shares on my router. It pops up an error dialog, with a message about "Failed to retrieve share list from server"? Sorry, I don't remember the exact error message.
I think I know what might be the problem. It seems that SMB1 may have been disabled for security reasons, but SMB2/3 may still be there. I don't exactly know how to find this out.
testparm passed. findsmb and smbtree didn't work (but they now do, after the following patch).
I edited /etc/samba/smb.conf and added the following to the network section...
client min protocol = NT1
server min protocol = NT1
name resolve order = bcast host lmhosts wins
restarted smbd and nmbd, and that seems to have fixed it. I think that this re-enables SMB1... but I'm no SAMBA expert here.
Now smbstatus shows...
Samba version 4.12.5-Ubuntu
PID Username Group Machine Protocol Version Encryption Signing
----------------------------------------------------------------------------------------------------------------------------------------
24943 nobody nogroup satellite-e55 (ipv6:fe80::c433:26d6:91d2:3475:59876) NT1 - -
19177 nobody nogroup satellite-e55 (ipv4:192.168.0.100:57868) NT1 - -
Service pid Machine Connected at Encryption Signing
---------------------------------------------------------------------------------------------
IPC$ 19177 satellite-e55 Sat Mar 20 07:17:40 PM 2021 PDT - -
IPC$ 24943 satellite-e55 Sun Mar 21 07:56:25 AM 2021 PDT - -
No locked files
Is this what's happening, and did I implement the correct/best fix? What happened in 20.xx that might have caused this problem?
Update #1:
nmap --script smb-protocols IPofServer/32
My router...
~$ nmap --script smb-protocols 192.168.0.1/32
Starting Nmap 7.91 ( https://nmap.org ) at 2021-03-22 07:01 PDT
Nmap scan report for caspurr.local (192.168.0.1)
Host is up (0.012s latency).
Not shown: 986 closed ports
PORT STATE SERVICE
53/tcp open domain
80/tcp open http
139/tcp open netbios-ssn
445/tcp open microsoft-ds
548/tcp open afp
631/tcp open ipp
5000/tcp open upnp
8200/tcp open trivnet1
9100/tcp open jetdirect
9101/tcp open jetdirect
9102/tcp open jetdirect
9103/tcp open jetdirect
20005/tcp open btx
49152/tcp open unknown
Host script results:
| smb-protocols:
| dialects:
| NT LM 0.12 (SMBv1) [dangerous, but default]
| 2.02
| 2.10
| 3.00
| 3.02
|_ 3.11
Nmap done: 1 IP address (1 host up) scanned in 4.21 seconds
My PC...
~$ nmap --script smb-protocols 192.168.0.100/32
Starting Nmap 7.91 ( https://nmap.org ) at 2021-03-22 07:03 PDT
Nmap scan report for ubuntu-eth0.local (192.168.0.100)
Host is up (0.00012s latency).
Not shown: 996 closed ports
PORT STATE SERVICE
80/tcp open http
139/tcp open netbios-ssn
445/tcp open microsoft-ds
631/tcp open ipp
Host script results:
| smb-protocols:
| dialects:
| NT LM 0.12 (SMBv1) [dangerous, but default]
| 2.02
| 2.10
| 3.00
| 3.02
|_ 3.11
