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I've FTP Server running on Windows Server 2012. FTP version is 8.0.9200.16384 In advanced settings for FTP under IIS, Allow Reading Files While Uploading is set to true and server is restarted. But still client is getting following error

550 The process cannot access the file because it is being used by another process

If the file is being used. Any guidance on something I'm missing or some option has to be added

Thanks in advance

Abhinav
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  • How is the file being accessed by the client? – bentek Jul 06 '15 at 14:33
  • This error could also mean the port is in use. http://goo.gl/ho27vX – CIA Jul 06 '15 at 14:33
  • Client is trying to get the file by FTP. – Abhinav Jul 06 '15 at 14:34
  • @CIA it seems there was an issue in FTP 7.5 . Not sure whether it is fixed in 8.092 http://forums.iis.net/t/1159198.aspx?FTP+7+5+Cannot+access+file+while+in+use – Abhinav Jul 06 '15 at 14:36
  • The "Allow Reading Files While Uploading" setting only applies to files that are being uploaded via FTP to be read before the upload completes, not allow reading files that are open for writing by another application/process on the host, such as is often the case with log files/files being modified by the host. Is this not the case you're running into? – austinian Jul 06 '15 at 16:40
  • @austinian you are right. The client is trying to get the files being written by another process. – Abhinav Jul 06 '15 at 16:52
  • Unfortunately, this seems to be either a design decision or a bug in IIS 7+, see this similar question: http://serverfault.com/questions/481270/ftp-iis-error-the-process-cannot-access-the-file-because-it-is-being-used-by-an – austinian Jul 06 '15 at 23:16

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This seems to be a limitation in IIS versions 7+. (According to this forum post, this wasn't a limitation in IIS 5.) I can't find official support for this claim, but I do see that some software vendors have circumvented this issue by ignoring these errors (and sometimes retrying later), example here and some users have gotten around this by using methods other than direct FTP access, either by copying the file and then using FTP, or using a different file access protocol, such as what happened here.

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