Yes, I saw that and that's why I wrote "silently declared unsupported". 
People were using FTP on GAE for quite some time:
http://stackoverflow.com/questions/2693412/does-google-app-engine-support-ftp/26283142#comment61998696_26283142

I wish support people had some experience actually using App Engine.
Perhaps then you would feel some of our frustration too.
Anyway, I've given up on FTP now, still clinging to GAE but what a joke of 
a product.

Emanuele (a 5 year paying customer)

On Thursday, 19 May 2016 02:22:03 UTC+12, joshuamo wrote:
>
> FTP is explicitly not supported for the Sockets API.  See "Limits and 
> Restrictions": https://cloud.google.com/appengine/docs/java/sockets/ 
>
> On Wed, May 18, 2016 at 7:18 AM, 'Nicholas (Google Cloud Support)' via 
> Google App Engine <[email protected] <javascript:>> wrote:
>
>> Thank you for posting your issue here though the App Engine public issue 
>> tracker <https://code.google.com/p/googleappengine/issues/list> would be 
>> a far better forum for this sort of report. I would strongly suggest filing 
>> a new issue with what you've provided above and adding a link to it here so 
>> that others sharing your experience may follow through to '*star*' your 
>> issue.
>>
>> In this new issue, be sure to include the following:
>>
>>    - A thorough description of the issue
>>    - Stack trace as you've provided above
>>    - App Engine SDK version
>>    - Code sample that can reliably reproduce this behavior so that we 
>>    can reproduce this ourselves
>>    - A time frame of when you started experiencing this issue and if it 
>>    persists
>>    
>> With the information requested above in a new public issue, we can 
>> investigate this appropriately.
>>
>> On Sunday, May 15, 2016 at 12:45:17 AM UTC-4, Emanuele Ziglioli wrote:
>>>
>>> Hi there,
>>>
>>> we use (passive) FTP and sockets have always been unreliable. Although, 
>>> by retrying in a task queue, usually they would work.
>>> For the past few days, they've stopped working altogether. For example
>>>
>>> System error: errno: 113, detail:no route to host
>>> java.net.SocketException: System error: errno: 113, detail:no route to host
>>>     at 
>>> com.google.appengine.api.socket.SocketApiHelper.translateError(SocketApiHelper.java:102)
>>>     at 
>>> com.google.appengine.api.socket.AppEngineSocketImpl.processConnectError(AppEngineSocketImpl.java:396)
>>>     at 
>>> com.google.appengine.api.socket.AppEngineSocketImpl.createSocket(AppEngineSocketImpl.java:498)
>>>     at 
>>> com.google.appengine.api.socket.AppEngineSocketImpl.connectToAddress(AppEngineSocketImpl.java:362)
>>>     at 
>>> com.google.appengine.api.socket.AppEngineSocketImpl.connect(AppEngineSocketImpl.java:352)
>>>     at java.net.Socket.connect(Socket.java:612)
>>>     at java.net.Socket.connect(Socket.java:540)
>>>     at java.net.Socket.<init>(Socket.java:437)
>>>     at java.net.Socket.<init>(Socket.java:220)
>>>     at 
>>> org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:514)
>>>
>>>
>>> I've tried using a different FTP server, it didn't help.
>>> This service is critical to us. Please fix it!
>>>
>>> Emanuele
>>>
>>> -- 
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>
>
> -- 
>
> Josh Moore |  Cloud Solutions Engineer |  [email protected] <javascript:>
>  |  
>

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