[erlang-questions] SSL {error, closed}

[Daniel Griffin]

I am using SSL sockets to talk between an erlang program and a twisted python program. Different processes in my erlang app occasionally have to open connections and the first one opens fine, then the second errors with {error, closed}. 

I don't know if I am misunderstanding something in SSL or Erlang. The simplest client code I could come up with is:

run_test()->

    ssl:start(),

    %%% works fine

    {ok, Conn} = ssl:connect("localhost", 2000, [binary, {packet, 0}, {keepalive, true}, {active, false}, { certfile, "controller.crt"}, {keyfile, "controller.key"} ]),

    %%% this next one will return {error, closed} 

    {ok, Conn1} = ssl:connect("localhost", 2000, [binary, {packet, 0}, {keepalive, true}, {active, false}, { certfile, "controller.crt"}, {keyfile, "controller.key"} ]).

The python side gets the connection both times. Bizarrely, if I retry a connection after getting {error, closed} it works. 

Any insight?

Dan

[Ingela Andin]

Hi!

It sounds like you are experiencing some kind of timing problem.
I tried to write a test case to repeat it but I am not getting
any problem. Which ssl-version you are running?

Regards Ingela Erlang/OTP team - Ericsson AB

2011/7/2 Daniel Griffin <dgr...@gmail.com>:

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[Daniel Griffin]

The twisted python server defaults to accepting SSL 2 or 3. I am using erlang R14B01. Is there some rule saying that you can't have multiple SSL connections between 2 programs? 

What sort of timing issues could I be having? 

Thanks,

Dan

[Ingela Andin]

Hi again!

2011/7/4 Daniel Griffin <dgr...@gmail.com>:

> The twisted python server defaults to accepting SSL 2 or 3. I am using
> erlang R14B01. Is there some rule saying that you can't have multiple SSL
> connections between 2 programs?

No, it should not be a problem.

> What sort of timing issues could I be having?

I will investigate tomorrow if there could be some sort of timing
issue. I am not saying
there is, I am just saying your description of what is happening
makes me think of strange timing issues, (even though I can not think
of a reason there should be sush an isssue at the moment) but I had
very little to go on. Knowing which version of the code you are
running makes it easier. If you have the possibility to try the
latest version of the code or atleast R14B03
that would be good.

[Ingela Andin]

Hi!

I have not actually pinpointed the problem but I got my test-case to fail on
R14B01 but runs fine on R14B02 and R1B03 and on the main development branch.
Hence upgrade and let me know how it goes.

Regards Ingela Erlang/OTP team - Ericsson AB

2011/7/4 Ingela Andin <ing...@erlang.org>:

[Daniel Griffin]

Thanks, I will do that today and respond with results. 

Dan

[Daniel Griffin]

Upgrading fixed it. 

Thanks for the help,

Dan