Network problems while using Indy - delphi

Question

function UploadToFTP(file: string ; PathSrv : string): Boolean;
var
server, port, user , password: string;
SR : TSearchRec;
begin
Result := True;
FEventLogger := TEventLogger.Create('Upload FTP');
if file <> '' then
begin
try
server := FServer;
port := FPort;
user := FUserName;
password:= FPassword;
FindFirst(file, faArchive, SR);
try // try except
idftp1.Host:= server;
idftp1.Port := StrToInt(port);
idftp1.Username:= user;
idftp1.Password:= password;
idftp1.Connect();
idftp1.Put(file,PathSrv+SR.Name);
except on E: Exception do begin
Result:= False;
FEventLogger.LogMessage('Exception : ' + E.Message , EVENTLOG_ERROR_TYPE , 0, 2);
WriteToLog('Exception: '+ file+' error message: '+ E.Message);
end;
end;
finally
end;
end;
end;
So I have this function that does an ftp upload to some large files on sometimes slow networks. I've tested it localy and it works ok, but on slow networks i get this eror in 99% of the time.
The specified network name is no longer available.
This is a very strange behavior, becouse the FTP is located on a server that has no disconnecting issues. I also try to watch, and it start the file upload and it does almost all the upload before throwing this error. So for example if I have a 100MB file it does 99MB of the upload then throws the error.
Any ideas what is causing this error or what can I do?
Also from time to time I have an other error
Socket Error # 10054
Connection reset by peer.
To mention,i've tried to upload this files using filezilla and it works, so the problem is somewhere in that code, I might miss something.

Answer 1

Are you using Symantec Endpoint Protection or KIS (Kaspersky Internet Security) ? Take a look here, here and here.
The "The specified network name is no longer available." is caused by Symantec Endpoint Protection 11.0, Symantec has identified this as a known issue.
Btw, in your code don't forget to call .Disconnect() after you're finished uploading the file.