![]() Looking here we find many attempts to load the cfNetwork.dll failing… “Disallowing a Fast I/O Operation in a Preoperation Callback Routine” (VS.85).aspx I right clicked one entry where result was “FAST IO DISALLOWED” and selected “Exclude ‘FAST IO DISALLOWED’” This is because this gives no indication that the actual file access failed, an IRP-based operation will be tried instead. I then launched the iPhone configuration utility. ![]() So straight to ProcMon set a filter where However it was definitely installed, re-installing, updating to latest iTunes did not make the error go away. The error message displayed after entry point not found suggested re-installation of Apple Mobile Device Support. Re-install of iTunes & iPhone Configuration utility didn’t fix the issue. Tried on a few machines in my environment, all had the same error. On launching iPhone Configuration Utility (iPCU) I was getting this error: The procedure entry point CFHTTPMessageSetHeaderFieldValue could not be located in the dynamic link library CFNetwork.dll. Examples on techniques for eliminating this at application level can be found in MSDN Article “Avoiding DLL Hell” īut if the app has a problem, you don’t have app virtualization as an option, and there is no fix from software provider available…a bit of ProcMon and file copies are probably all you need to fix it. ![]() However even without app virtualization on modern Windows such issues are rare and with good application design can be completely eliminated. Today you can use application virtualization technologies such as ThinApp or App-V to eliminate these issues. When DLL conflicts occurred it was called ‘DLL HELL’ mostly because finding the root cause of such problems was a hellish experience. It was critical to install all apps, service packs, option packs in very specific orders to get a reliable system. In Windows NT 4.0 DLL hell was a common occurrence. ![]()
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