c# - What could cause a 401 error in a git pull (via libgit2sharp)? -

this pull wrapper works on local network:

internal mergestatus pull() {     using (var repo = new repository(repositoryroot))     {         var merger = new signature(username,emailaddress,datetimeoffset.utcnow);          var options =new pulloptions {               fetchoptions = new fetchoptions()                 {                     credentialsprovider = credentialshandler                 }             };          mergeresult result = repo.network.pull(merger, options);         return result.status;     } } 

the following shows credentialshandler using along commented-out attempt use usernamepasswordcredentials gave me same result.

public libgit2sharp.handlers.credentialshandler credentialshandler  {         {         if (credentialshandler_ == null)         {             credentialshandler_ = (_url, _user, _cred) => new defaultcredentials();              //this not fix 401 error on jupiter box             //credentialshandler_ = (_url, _user, _cred) => new usernamepasswordcredentials             //{             //  username = username,             //  password = pwd,             //};         }         return credentialshandler_;     }      set     {         credentialshandler_ = value;     } } 

the pull function works beautifully on local network when use machine on different network identical directory structure , clone of git repository, 401 error:

libgit2sharp.libgit2sharpexception: request failed status code: 401 @ libgit2sharp.core.ensure.handleerror(int32 result) @ libgit2sharp.core.ensure.zeroresult(int32 result) @ libgit2sharp.core.proxy.git_remote_fetch(remotesafehandle remote, signature signature, string logmessage) @ libgit2sharp.network.dofetch(remotesafehandle remotehandle, fetchoptions options, signature signature, string logmessage) @ libgit2sharp.network.fetch(remote remote, fetchoptions options, signature signature, string logmessage) @ libgit2sharp.network.pull(signature merger, pulloptions options) @ gitface.gitfilelistcontroller.pull() in c:\code\workspace\gitface\gitfilelistcontroller.cs:line 190

note when use git bash , enter 'git pull', need enter password on both local , network computers both pull changes remote repository (fwiw, actual repository in tfs on local network). process pulling , pushing via git bash identical 2 computers surprised when libgit2sharp code behaved differently 1 other.

note: did not work:

private int gitcredentialhandler(out intptr ptr, intptr curl, intptr usernamefromurl, gitcredentialtype credtypes, intptr payload)         {             string url = laxutf8marshaler.fromnative(curl);             string domain = configurationmanager.appsettings["domain"];             if (url.startswith(@"http://"))             {                 url = string.format(@"http://{0}\\\{1}", domain, url.substring(7));             }             else if (url.startswith(@"https://"))             {                 url = string.format(@"https://{0}\\\{1}", domain, url.substring(8));             }              string username = string.format(@"{0}\{1}", domain, laxutf8marshaler.fromnative(usernamefromurl));             supportedcredentialtypes types = default(supportedcredentialtypes);             if (credtypes.hasflag(gitcredentialtype.userpassplaintext))             {                 types |= supportedcredentialtypes.usernamepassword;             }             if (credtypes.hasflag(gitcredentialtype.default))             {                 types |= supportedcredentialtypes.default;             }              var cred = credentialsprovider(url, username, types);              return cred.gitcredentialhandler(out ptr);         }