Good day Com,
I am curious about this issue.
Could you share related coding &exception when you access Portal?
Did you use the following proxy to connect Portal?
ClientCredentials mycredentials = new ClientCredentials();
mycredentials.UserName.UserName = "...";
mycredentials.UserName.Password = "...";
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
OrganizationService = (IOrganizationService)new OrganizationServiceProxy(new Uri("..."), null, mycredentials, null);
if (OrganizationService != null)
{};
In addition ,have your tried the above coding to successfully connect your Org url ?
Thanks.