我们有一个使用插件的 Web 应用程序。该系统用于许多成功部署的安装中，但在一个实例中，我们看到了一个间歇性问题。有时它会无法加载用户创建的插件 - 请参阅下面的融合日志。当它发生故障时，用户将服务器切换到他们的冗余服务器并继续，直到问题出现在冗余服务器上（故障之间没有具体的时间 - 可能是数小时到数周），然后再次切换回原始服务器（再次会很好）。我们已经获得了插件的源代码，并确认这不是代码/dll 本身的问题。
*** Assembly Binder Log Entry (2013-06-18 @ 00:32:49) ***
The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.
Assembly manager loaded from: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll
Running under executable c:\windows\system32\inetsrv\w3wp.exe
--- A detailed error log follows.
=== Pre-bind state information ===
LOG: User = ***\***
LOG: Where-ref bind. Location = D:\Program Files\***\***\***\plugins\***.dll
LOG: Appbase = file:///D:/Program Files/***/***/***/plugins/
LOG: Initial PrivatePath = D:\Program Files\***\***\***\plugins\references\
LOG: Dynamic Base = NULL
LOG: Cache Base = D:\Program Files\***\***\***\plugins\cache\79797f4b-d645-4a33-ad9d-c75f1c548e15
LOG: AppName = ***
Calling assembly : (Unknown).
===
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: Using application configuration file: D:\Program Files\***\***\webfiles\web.config
LOG: Using host configuration file: \\?\C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet.config
LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Attempting download of new URL file:///D:/Program Files/***/***/***/plugins/***.dll.
LOG: Assembly download was successful. Attempting setup of file: D:\Program Files\***\***\***\plugins\***.dll
LOG: Entering download cache setup phase.
LOG: Assembly Name is: ***, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
LOG: Re-apply policy for where-ref bind.
LOG: Where-ref bind Codebase matches what is found in default context. Keep the result in default context.
LOG: The post-policy assembly reference requires probing again.
LOG: Switch from LoadFrom context to default context.
LOG: Using application configuration file: D:\Program Files\***\***\webfiles\web.config
LOG: Using host configuration file: \\?\C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet.config
LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///D:/Program Files/***/***/***/plugins/***.DLL.
LOG: Assembly download was successful. Attempting setup of file: D:\Program Files\***\***\***\plugins\***.dll
LOG: Entering download cache setup phase.
ERR: Setup failed with hr = 0x80070002.
ERR: Failed to complete setup of assembly (hr = 0x80070002). Probing terminated.
关于什么可能导致它以这种方式间歇性失败的任何想法？