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https://issues.apache.org/jira/browse/DERBY-3644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-3644:
--------------------------------------

    Affects Version/s: 10.4.1.3
                       10.4.2.0

I think this is a regression. I've tested that NetworkServerControl from 
10.4.1.3, 10.4.2.0 and 10.5.1.1 can't talk to a 10.3.3.0 (or earlier) server. 
Tried runtimeinfo, ping and shutdown.

If we decide that this regression is acceptable (the workaround is simple 
enough: don't use derbynet.jar>=10.4 to talk to server<10.4) we should at least 
make the compatibility tests run cleanly.

> NetworkServerControl.ping() on trunk against 10.3.2.1 and older servers give 
> 'DRDA_InvalidReplyHeader2.S:Invalid reply header from network server: Invalid 
> string . Plaintext connection attempt to an SSL enabled server?'
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3644
>                 URL: https://issues.apache.org/jira/browse/DERBY-3644
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.4.1.3, 10.4.2.0, 10.5.1.1
>         Environment: All
>            Reporter: Ole Solberg
>
> Since 2008-02-29 r632502(DERBY-2109) the compatibility tests run on trunk has 
> reported
> 'DRDA_InvalidReplyHeader2.S:Invalid reply header from network server: Invalid 
> string . Plaintext connection attempt to an SSL enabled server?'
> when doing NetworkServerControl.ping() on trunk against 10.3.2.1 and older 
> servers.
> Is this a regression or according to spec?
> The compatibility test itself, i.e. the client-server testing is OK.

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