This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.
When accessing K2 Designer an error is raised: "An error occurred trying to authenticate the user."
When expanding more details below the error can be seen:
"An error occurred trying to authenticate the user."
System.DirectoryServices.DirectoryServicesCOMException (0x80072020): An operations error occurred. at System.DirectoryServices.PropertyValueCollection.PopulateList() at System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry entry, String propertyName) at System.DirectoryServices.PropertyCollection.get_Item(String propertyName) at System.DirectoryServices.AccountManagement.PrincipalContext.DoLDAPDirectoryInitNoContainer() at System.DirectoryServices.AccountManagement.PrincipalContext.DoDomainInit() at System.DirectoryServices.AccountManagement.PrincipalContext.Initialize() at System.DirectoryServices.AccountManagement.PrincipalContext.get_QueryCtx() at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithTypeHelper(PrincipalContext context, Type principalType, Nullable`1 identityType, String identityValue, DateTime refDate) at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithType(PrincipalContex)
When looking at the IIS authentication for the K2 Designer site, it is observed that the Windows authentication is disabled. When reading the error it seems that Windows authentication is attempted but not allowed.
Enabling the Windows authentication in the authentication of the K2 Designer site in IIS resolves this issue.