QC用IE8打开出现403 Forbidden如何解决

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用IE8打开QC，突然出现403 Forbidden
详细信息为：
Forbidden
You don't have permission to access /qcbin on this server.
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Apache/2.0.59 HP-UX_Apache-based_Web_Server (Unix) mod_ssl/2.0.59 OpenSSL/0.9.8d DAV/2 Server at prp-qcbin15.atlanta.hp.com Port 443

QC证书我看了下都没有问题，这个要怎么解决呢？望知道或者了解的人给点帮助，谢谢！