Build failed in Jenkins: Knox-master-patch-scan #43756

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See <https://builds.apache.org/job/Knox-master-patch-scan/43756/display/redirect>

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Started by timer
[EnvInject] - Loading node environment variables.
Building remotely on H1 (Hadoop) in workspace <https://builds.apache.org/job/Knox-master-patch-scan/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/apache/knox.git # timeout=10
Fetching upstream changes from https://github.com/apache/knox.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/apache/knox.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision 22f0af4de5ac89a7ead9d6e3958262b7a4fda9c6 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 22f0af4de5ac89a7ead9d6e3958262b7a4fda9c6
 > git rev-list 22f0af4de5ac89a7ead9d6e3958262b7a4fda9c6 # timeout=10
[Knox-master-patch-scan] $ /bin/bash /tmp/hudson1847784565864550523.sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (52) Empty reply from server
Could not retrieve available patches from JIRA
Build step 'Execute shell' marked build as failure

Jenkins build is back to normal : Knox-master-patch-scan #43757

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See <https://builds.apache.org/job/Knox-master-patch-scan/43757/display/redirect>