Sharepoint: OpenSearch common forms/cookie authentication - authentication

I have an OpenSearch provider that I am trying to integrate with Sharepoint (Online). This provider is protected by authentication.
Sharepoint supports Cookie or Form authentication for OpenSearch. When I give a url with login page and click Enter Credentials it shows my page, I enter my credentials and it shows popup asking if authentication was successful. I clicked yes and then it gives the following error:
"An error occurred when communicating with the remote server. This may be because the URL provided was malformed or the site might be unavailable or it could not be reached within the specified timeout or the proxy settings are not configured."
I have tried multiple sites, including for example google:
https://accounts.google.com/ServiceLogin?hl=fr&continue=https://www.google.fr/%3Fgfe_rd%3Dcr%26ei%3D9j-lVdXLMYXF8AesrK-4Dg%26gws_rd%3Dssl#identifier
Do you know if there are some required configuration on the site?

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SSRS 2019 logon failure when accessing through HTTPS

I have a question regarding SQL Server Reporting Services 2019:
We have received a HTTPS-certificate and added a URL for both Web Service and Web Portal. When we try to access either /Reports or /ReportServer on HTTP we can get through with no problem, but when we try to access on HTTPS then we are met with a logon dialog which will give three attempts at log on before displaying a white page. All attempts at entering a valid combination of user name and password returns a 401 error.
We've tried removing and reinserting all bindings for HTTP, HTTPS, SSL, changing logon mechanism in the config file to use Kerberos, NTLM or a combination of those but nothing works.
Does anyone what the source of this problem might be and how to solve it?
We figured out what the problem was. Authentication issues did not behave the same for HTTP and HTTPS. My test user wasn't a member of the correct user group. Once we gave it "System User" access then we could log in.

Access specific URL in my app service when using Azure AD Authentication

We are currently having problem allowing a user to a specific URL without logging in in Azure AD authentication.
We are successful in getting token and using it for our API's. But we are currently having problem allowing user to access a URL without them logging in.
What we have tried so far was this links
https://learn.microsoft.com/en-us/graph/auth-v2-service
https://learn.microsoft.com/en-us/azure/app-service/configure-authentication-provider-aad
Thanks!
In your second link, in the azure portal-> your app service -> authentication and authorization screen, make sure the "action to take when request is not authenticated" is set to allow anonymous. if you set that option to "log in with active directory" that forces authentication on every page no matter what. And ensure in your code that page doesn't require login eg.remove the [authorize] tag.

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I have enabled IWA on WSO2 IS 5.0 and configured the browser for the same. Now when I try to access the SP through non-domain user , I get browser pop-up to enter the user credentials. Now when I cancel the prompt I get a Apache default error page for 401.
Is there any way wherein I can configure customize error page for the same? I tried to configure the error-page tag in D[WSO2_IS_HOME]\repository\conf\tomcat\web.xml but this doesn't work for me.
If I configure for an existing general error page like this
<error-page>
<error-code>401</error-code>
<location>test/generic-exception-response.jsp</location>
</error-page>
it displays the carbon login page and on encountering 401. On entering the login details here I get the configured error page
I'm sure some security setting is avoiding this to work as expected. Can anybody give me pointers to the solution?

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I am using version 5.1 of Pentaho DI (Kettle) and am having an issue with the "Rest Client" step. The step executes properly and successfully, but the result says I do not have permission to use the API. I have confirmed in another tool that I do have permission. I have entered my login information on the Authentication tab and have built my URL to include my token.
What am I missing?
ADDITIONAL INFO: I am having the same issue with the "HTTP Post" step. The status being returned from the API is 403.
403 is "Forbidden". Check that you have the correct credentials to access the webservice. The request went through and the server rejected sending the response because username/password are not correct or otherwise the user does not have permissions for that request. Can you see the response correctly in a browser when you enter EXACTLY the same credentials? To avoid active browser sessions masking the real issue I'd test it on incognito/private browsing mode on the browser.

Cannot connect to SharePoint 2010 Web Site whilst on the server locally - Access denied

I am getting the error below while getting the Search Crawlers to work:-
The start address sts4://mysites/contentdbid={3d198865-7f27-4633-bd71-902795032d78} cannot be crawled.
*Context: Application 'Search_index_file_on_the_search_server', Catalog 'Search'*
Details:
Access is denied. Verify that either the Default Content Access Account has access to this repository, or add a crawl rule to crawl this repository. If the repository being crawled is a SharePoint repository, verify that the account you are using has "Full Read" permissions on the SharePoint Web Application being crawled. (0x80041205)
I have checked all permissions and they appear to be in order.
While investigating this problem I discovered that when I RDP to the SharePoint server and connect to the sites whilst on the server (locally to the server) I get access denied.
The Central Administration works just fine, but all the other Web Applications (intranet & mysites) will not allow me to login. I get prompted to enter username and password (like I do when connecting to CA) but it never accepts the login. These sites work without any problems when accessed from client workstations.
When I check the site log file it is reporting a http 401 Unauthorised error.
Note: The sites are not using Claims Authentication
Any ideas on how to fix this?
Thanks,
Andrew
You're probably having the loopback issue problem. Follow instructions in this KB article: http://support.microsoft.com/kb/896861