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https://issues.apache.org/jira/browse/GEODE-4450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350837#comment-16350837
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Bruce Schuchardt commented on GEODE-4450:
-----------------------------------------
Undoing Jinmei's change to CacheClientNotifier.registerGFEClient() fixes this
problem.
I modified the test ClientRegisterInterestAuthDUnitTest.testRegisterInterest to
add a security-client-dhalgo setting in the client and server to reproduce the
problem.
> setting a client/server diffie-hellman algorithm breaks client/server
> subscriptions
> -----------------------------------------------------------------------------------
>
> Key: GEODE-4450
> URL: https://issues.apache.org/jira/browse/GEODE-4450
> Project: Geode
> Issue Type: Improvement
> Components: client/server
> Reporter: Bruce Schuchardt
> Priority: Major
>
> Having found that there are no tests for the security-client-dhalgo setting I
> modified a test to use it. The client/server handshake in the subscription
> thread (cache client updater) hung on the server side trying to read client
> credentials.
> I tracked this down to CacheClientNotifier.registerClient, which sends a 105
> byte to the client along with some other bytes in its writeMessage() method.
> The client isn't expecting this message and interprets the 105 as a failure
> to register with the server. The client then abandons the handshake and the
> server hangs until its read times out.
> See also GEODE-4353, which wants to deprecate this broken feature.
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