Can you add data using ArcMap 10.6.1 from Portal 10.5?

[BillFox]

Several desktop users have reported this error:

After updating ArcMap from 10.5.1 to 10.6.1 they're getting this ArcMap popup error when they try to add data from Portal.

The request was aborted: Could not create SSL/TLS secure channel.

[RandallWilliams]

Ah. The plot thickens. This is good. Can you browse to http://portal.domain.com/webadaptor/portaladmin/security/sslCertificates  (replacing the placeholders with your Portal instance particulars), log in as an admin to the portal administrator API, and check the Web Server SSL Protocols: value? If it says TLS 1.0, TLS 1.1, and TLS 1.2 I'll have more to offer. I'd like to check what the portal is supporting. Either the portal or the web adaptor server don't support TLS 1.2, and I think that's the issue.

[BillFox]

Portal Administrator Directory

Web Server SSL Protocols:

TLSv1.2,TLSv1.1,TLSv1

[BillFox]

ArcGIS Server is on its own machine separate from portal and it lists this:

Security/Config

SSL Protocols:

TLSv1.2,TLSv1.1,TLSv1

From my win 10 desktop, opening ArcGIS Server's home > security > config url with ie 11 > page > properties

Connection: TLS 1.2, AES with 256 bit encryption (High); ECDH_P256 with 256 bit exchange

This is different than the reply from the portal url above.

TLS 1.0 vs. TLS 1.2

The web adaptors for ArcGIS Server and Portal are on the same machine as Portal

Randall Williams‌

[BillFox]

Here's the fixed it URL, I mean PURL (;Parallel Universe Resource Locator;)

https://community.esri.com/community/esri-software-security-privacy/blog/2018/12/13/portal-for-arcgi... 

Randall Williams‌ George Thompson‌ Peter Buwembo‌