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  1. ,

    401 means "Unauthorized", so there must be something with your credentials. You need to pass the authentication to let the server know its a valid user. Check whether the authentication details are provided.

Solutions on the web

via Google Groups by Pedric Kng, 11 months ago
java.io.FileNotFoundException: https://localhost:8443/cas/p3/serviceValidate?ticket=ST-2-Obd5xdXhpuUaKdFbU2sM-cas&service=https%3A%2F%2Flocalhost%3A8443%2Fcas-management%2Fmanage.html
via GitHub by zeng531196248
, 4 months ago
java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:8099/serviceValidate?ticket=ST-7-dwUiYKh6HgYaKeo17eOy-cas01.example.org&service=http%3A%2F%2Flocalhost%3A9999%2Ffavicon.ico
via Stack Overflow by Araf
, 2 months ago
javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No subject alternative DNS name matching URL found.
via Google Groups by Lynch maniac, 10 months ago
java.io.IOException: Server returned HTTP response code: 500 for URL: https://localhost:8443/cas/serviceValidate?ticket=ST-1-YZaBWIkNHt5qu5hBI03V-example.fr&service=https%3A%2F%2Flocalhost%3A8443%2FmywebappOrig%2Fprotected%2F
Empty query.