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https://issues.apache.org/jira/browse/SPARK-11765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15322503#comment-15322503
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Willy Lee commented on SPARK-11765:
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The problem as I see it is that 4045 is an unused port on most machines, it's
just that many browsers refuse to connect to it expecting a malicious site
trying to avoid firewall rules by using the port commonly used for lockd.
Chrome, Safari and Firefox all refused to connect to a perfectly fine port 4045
on our Spark infrastructure.
> Avoid assign UI port between browser unsafe ports (or just 4045: lockd)
> -----------------------------------------------------------------------
>
> Key: SPARK-11765
> URL: https://issues.apache.org/jira/browse/SPARK-11765
> Project: Spark
> Issue Type: Improvement
> Reporter: Jungtaek Lim
> Priority: Minor
>
> Spark UI port starts on 4040, and UI port is incremented by 1 for every
> confliction.
> In our use case, we have some drivers running at the same time, which makes
> UI port to be assigned to 4045, which is treated to unsafe port for chrome
> and mozilla.
> http://src.chromium.org/viewvc/chrome/trunk/src/net/base/net_util.cc?view=markup
> http://www-archive.mozilla.org/projects/netlib/PortBanning.html#portlist
> We would like to avoid assigning UI to these ports, or just avoid assigning
> UI port to 4045 which is too close to default port.
> If we'd like to accept this idea, I'm happy to work on it.
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