Symptom:
Users cannot log in to Dropbox and see the error: No external session was found for the given external source ID.
In the DSSErrors.log, errors similar to the following appear:
2026-01-28 09:55:19.335 [HOST:tec-w-1242012][SERVER:CastorServer][PID:3188][THR:13356][Database Classes][Error][UID:34F26C3448A3669BA02C7EBBA9606361][SID:7DBB3BE37CDE9C66D8A8C2037E389481][OID:0][ConnectionKeeper.cpp:85] Authentication for Connections to Dropbox failed. Disconnected.
Error type: Data Import Error. DROPBOX_ERROR: Authentication failed with ClientKey: xxxxx******xxxx ClientSecret: xxxx******xxxx AccessToken: xxxxxxxxxxxxx**********************xxxxxxxx- Without Any Proxyinfo (com.dropbox.core.NetworkIOException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target). Connection String: BINARY;DROPBOX;CLIENT_ID=xxxxxxxxxxx;.
Cause:
Starting on January 19, 2026 (19:00:00 EST), Dropbox began using TLS certificates issued from a new root CA.
Older MicroStrategy versions embed the Dropbox SDK, and that SDK includes its own list of trusted root certificates, rather than relying on the root certificates provided by the Java runtime. Because this embedded list does not contain the new Dropbox root CA, the SSL handshake fails with:PKIX path building failed: unable to find valid certification path to requested target
As a result, authentication to Dropbox fails and the product reports login or external session errors.
Solution:
This document provides step-by-step guidance on applying that patch on older versions so that Dropbox authentication works again.
Apply the updated Jar file:
