Directory name is invalid when saving certificate

[JohnLahr]

I've been having this problem since I upgraded to the latest release, and it seems to happen now to any release even if I clear all files from both the LetsEncrypt directory and from the directory in %AppData%\Roaming.

Upon trying to create a certificate, all works as is should up until the point where it tries to save and apply the new certificate. I'll find the -crt.der in my AppData directory, but IIS doesn't see a usable certificate, and the LetsEncrypt console reads:

Requesting Certificate
  Request Status: Created
  Saving Certificate to C:\Users\<myusername>\AppData\Roaming\letsencrypt-win-simple\httpsacme-v01.api.letsencrypt.org\example.mydomain.com-crt.der
System.IO.IOException: The directory name is invalid.

    at System.IO.__Error.WinIOError(Int32 errorCode, String maybefullPath)
    at System.IO.__Error.WinIOError()
    at System.IO.Path.InternalGetTempFileName(Boolean checkHost)
    at LetsEncrypt.ACME.Simple.Program.GetIssuerCertificate(CertificateRequest certificate, CertificateProvider cp)
    at LetsEncrypt.ACME.Simple.Program.GetCertificate(Target binding)
    at LetsEncrypt.ACME.Simple.Program.Auto(Target binding)
    at LetsEncrypt.ACME.Simple.Plugin.Auto(Target target)
    at LetsEncrypt.ACME.Simple.Program.Main(String[] args)
Press enter to continue.

I tried running as Administrator assuming it was a permission issue, but that hasn't solved anything. (Plus the file is showing up in the directory, just not in IIS)

[rkerber]

I don't think it will show anything else, but could you enable Debug Logging and see if you see anything else in the Event Logs?

[JohnLahr]

It doesn't provide any new information, just sort of repeats itself. It's still just claiming the save location is in an invalid directory despite the fact that I can see the file there.

[rkerber]

#146 Might help with this. Otherwise i'm not sure what's causing it.

[nul800sebastiaan]

v2 will feature a configurable path for the output directory (see #394).
Since this has been inactive for a few months I'll close it now. Please feel free to re-open this if you have steps to reproduce.