Data read through socket on a remote server is empty

We have a client-server software made in java.

Client part sends a string:

dataOutputStream.writeUTF("User");

Server reads this string:

String login = dataInputStream.readUTF();
System.out.println("User accepted: " + login);

The server part is launched on amazon ec2. We have 2 offices and from 1 office everything works fine: server accepts the socket and read the data correctly, but from another office the server accepts the socket, however reads empty strings.

All the ports are opened for our IPs in the EC2 control panel.

I have installed WireShark and checked if correct data goes to the server and yes, it is correct.

Both offices are running the same client part. The only difference i know is that office 1 have Win 7 and 8 (works on both, tried different machines) and office 2 have Win 10 (doesn't work, tried different machines)

What could be the reason of such behavior? What we could check / try to resolve it?

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