Getting error by "Target Server TLS Test"

Not applicable

In order to connect by self-siged cert and one way TLS between Apigee Edge(Cloud/Free) and on-premise, I uploded self-signed cert to Apigee Edge. Then I tried "Target Server TLS Test" on TLS Kestores setting of Enviroments in Menu .
I got the following message as the test result, and its test connection was failed.
Could you tell occurrence reasons and solutions for the following message?

Error message: Invalid Truststore. Unable to find valid certification path to requested target

*Additional informations
Incidentally, I tried connection directly to target service on on-premise from other server by self-service cert and one way TLS via the Internet, its connection was succeeded. I have already confirmed that the target service was available.
0 1 239
1 REPLY 1

@Jiro Saito Hello Jiro, Is this issue resolved? I am facing same error. Please suggest the fix. Thanks in advance : Uday