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测试 Inventory Subscription 提供的inventory push的URL 回调接口失败

测试接口返回:I/O error on POST request for \"">https://xxxxxxxxxx\": PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target; nested exception is javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target,
看错误描述应该是tiapi 调用回调接口时证书验证不通过。

我们已经确认回调接口可以正常外部访问回调接口,并且回调接口配置了有效的ssl证书。
请问回调接口的ssl证书有什么要求吗?