How to Connect a Windows 7 Client to an Old Samba?

Sometimes you get in contact with legacy systems – real legacy systems. In this case it is a Sun Microsystems Netra T1-AC200 with Solaris 9 (aka SunOS 5.9) and a samba version used in prehistoric times:

# smbd -V
Version 2.2.12

Anything I tried to get my Windows 7 connected to this system – it failed. Thankfully I finally found this (German) instruction:

First I had to start regedit and find my way to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters. There I added the following two DWORDs:

1. DomainCompatibilityMode – Value: 1
2. DNSNameResolutionRequired – Value: 0

After that I restarted my system and … still could not connect.

So i started secpol.msc. There I changed Local Policy/LAN Manager authentication level to Send LM & NTLM - M – use NTLMv2 session security if negotiated and de-checked the value Require 128-bit encryption. at Local Policy/LAN Manager Authentication Level policy/Minimum session security for NTLM SSP based (including secure RPC) servers.

Another system reboot and my samba connect worked. Fine.