b4j posting file using httpUtils erroring

This is not a question for b4j actually. The code I have worked great until 2 weeks ago. In fact it still works when I try to upload very small files.
I'm using httpUtils, to postFile to my server (which is not maintained by me).
If I send a, say 5kb file, everything runs ok.
If I send a file of 800kb, I get this:

INFO: I/O exception (java.net.SocketException) caught when processing request: Software caused connection abort: socket write error

Again, everything worked great until two weeks...

b4j posting file using httpUtils erroring

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