Since upgrading to OpenSuse 15.5, I've had issues with ntlm_auth when running Samba 4.18.6 as an ADDC. This is new behavior that wasn't present in 4.13.3 ntlm_auth --username=zombie --diagnostics Password: Reading winbind reply failed! (0xc0000001) Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test LM and NTLM failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test NTLM failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test NTLM in LM failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test NTLM in both failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test NTLMv2 failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test NTLMv2 and LMv2 failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test LMv2 failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test NTLMv2 and LMv2, LMv2 broken failed! Reading winbind reply failed! (0xc0000001) Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test NTLM and LM, LM broken failed! Reading winbind reply failed! (0xc0000001) Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test Plaintext failed! Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test Plaintext LM broken failed! Reading winbind reply failed! (0xc0000001) Reading winbind reply failed! (0xc0000001) diagnose_ntlm_auth: Test Plaintext NT only failed! Reading winbind reply failed! (0xc0000001)