Mono, NTLM and empty Domains

我正在使用Mono 2.6.7 -如果我没有指定一个域，请求的主机将被用于NTLM身份验证-这会导致登录失败。

1 -工作:登录用户名'domainXYZ/User123' -> Wireshark捕获NTLM包:

Domain name: domainXYZ
User name: User123

2 -工作:登录用户名'User123'在URL http://1.2.3.4/a.txt -> 。Net/Windows :

Domain name: NULL
User name: User123

3 -不工作:登录与用户名'User123' URL http://1.2.3.4/a.txt -> Mono/Debian:

Domain name: 1.2.3.4
User name: User123

这个身份验证请求不工作，因为在目标机器上没有名为1.2.3.4的域。

我的认证代码没有域信息:

NetworkCredential credential = new NetworkCredential(request.Username, request.Password);
// credential = new NetworkCredential(request.Username, request.Password, null); also not working
CredentialCache credentialCache = new CredentialCache { { new Uri(request.Url), "NTLM", credential } };
webClient.Credentials = credentialCache;

任何想法?