Visual Studio 2012: Can't access Sharepoint Web Services because of Discovery Credentials Prompt

Question

 
Hi.
I've exactly the same problem that is descripted
here, so I'll add its description here.
My SharePoint is 2010
I am trying to access the web services that are located in this url:
http://<part_of_th_url_omitted>/_vti_bin/Lists.asmx. I have no problem accessing
this URL using my broswer, that is, when I type the URL and my browser's address bar and press enter, I can see the list of the services that are available. I encounter no problem by accessing this site through my browser at all.
However, when I try to access the services from that URL (http://<part_of_the_url_omitted>/_vti_bin/Lists.asmx),
a Discovery Credential Dialog box prompts me for my username and password. SO what I do is I enter my username and password that I used to access the sharepoint using my browser, the problem is, the dialog box doesn't seem to accept the username and password
that I enter as the dialog box is keep on appearing.
Below are the detailed steps on how I go about in adding the Web Services.
1. From the Solution Explorer, I right click on the "Service References" folder.
2. From the context menu that appears, I Click on "Add Service Reference...". The "Add Service Reference" Dialog box will appear.
3. From the "Add Service Reference" dialog box, I click on the "Advanced,,," button which can be seen at the bottom-left of the dialog
box. The "Service Reference Settings" Dialog box will appear.
4. From the "Service Reference Settings" dialog box, I click on the "Add Web Reference..." dialog box. The "Add Web Reference"
Dialog box will appear. This is the dialog box where I can type the URL of the service that I want to access. So I type "http://<part_of_the_url_omitted>/_vti_bin/Lists.asmx".
AFter typing that, I click on the Go button (which is the green arrow button at the right of the address bar of this dialog box).
5. After doing that, a prompt dialog box will appear which has the title "Windows Security" and it is aking for my username and password. SO
what I do is I enter the Username and the Password that I use in accessing the sharepoint site (http://<part_of_the_url_omitted>/_vti_bin/Lists.asmx)
6. The prompt seems to accept the Username and Password, but after that, a new dialog box appeared with the title "Discovery Credential" and
it says "The Service 'http://<part_of_the_url_omitted>/_vti_bin/Lists.asmx' requires a username and
password". SO what I do is I enter again the un and pw that I use to access the sharepoint site, the one that I used inm the previous dialog box.
7 After entering the username and the password and clicking the OK button. The dialog box reappears still asking for a username and a password, but this
time, it shows a different message. It says "The Service 'http://<part_of_the_url_omitted>/_vti_bin/Lists.asmx/$metadata'
requires a username and password". SO it really, what oonly changed is the URL, it has now the $metadata at the end. What do I do? I eneter the username and password again.
8. After clicking Ok again, the dialog box reappears, now it says "The Service 'http://<part_of_the_url_omitted>/_layouts/1033/error.aspx'
requires a username and password." Now it shows a very different username. Of ocurse, I still type in the username and password and click Ok.
9. after doing that, the dialog box reappears again and it shows the same message as in step 6. So I do steps 6, 7 and 8 in a loop.
10. When I finally get tired of entering the username and password, I click on cancel. The message box reappears again. So I click on cancel again. After
doing that, I can then, surprisingly, see the list of the web services. However, not surprisingly, I still can't use it because the "Add Reference" button which I need to click in order to use the Web services is disabled. So I can only see the list
of the services but I can't use it.

Answer 1

Hi Gaston,
I would suggest you the following thread, check whether it meet your scenario, it shows that if you have set IE options to remember the username and password, and you have enter wrong password before, this issue may happen:
http://social.msdn.microsoft.com/Forums/sharepoint/en-US/a7f466a5-0e4a-4f75-ad29-9591e2357e10/sharepoint-web-services-visual-studio
Thanks,
Qiao Wei
TechNet Community Support