amazon ec2 - IIS FTP cannot connect, 421 Service not available error -

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IISFFF server stopped accepting connections, "421 service not dropped, remote server connections has stopped." The error message was rebooted after the example. The problem does not seem to be a firewall problem.

I installed an IIS FTP server on an EC2 example that ran Windows Server 2012 R2. Very basic, my boss just wanted plain FTP I had installed a SFTP server on the same example before, using Sigwin SSDD, which was working just fine. I have established the "default" IIS FTP server, and it was working fine for a few days, as long as it was in the file transfer, it was hanging. According to the AWS Monitor the CPU was estimated at 100%. I could not do RDP in this example, so I had to reboot it since, I could not connect to the IIS FTP server. According to the Task Manager, the status of "FTPSCC" process is going on. I've closed it and have started it several times, the Windows Firewall is off, the AWS firewall port 20, 21, and 50,000-51,000 are open.

From the local command prompt: 

  & gt; There is no setting, which I know, has changed. Connection connected to closed connection by FTP localhost remote host

From the remote command prompt: 

  $ ftp myact@xx.xx.xx xx.xx.xx.xx 421 Not connected to the service , The remote server closed the connection.

But SFTP works: 

  $ sftp myact@xx.xx.xx.xx myact@xx.xx.xx's password: *** * Not familiar with IX, and it starts running, but I do not know that FTP stopped working after example reboot. Note that the EC2 example is using an elastic IP, so before the problem starts the same public IP address.

Sorry, the problem has been misset in the IIS FTP site site binding. Examples of EC2 are 2 IP addresses, a private and a public. It seems that the FTP server EC2 example was installed with a personal IP address, and when this example was rebooted, it got a different private IP, but using the LOLIC IP feature, the same public IP Assigned from Live and learn.


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