http://buildbot.python.org/all/builders/s390x%20Debian%203.6/builds/530/steps/test/logs/stdio

[Mtlgroupmarcel]

http://buildbot.python.org/all/builders/s390x%20Debian%203.6/builds/530/steps/test/logs/stdio

ERROR: test_ftp (test.test_urllib2net.OtherNetworkTests) (url='ftp://ftp.debian.org/debian/README')

ERROR: test_ftp_basic (test.test_urllib2net.TimeoutTest)

ERROR: test_ftp_default_timeout (test.test_urllib2net.TimeoutTest)
...
ftplib.error_temp: 421 There are too many connections from your internet address.
...
urllib.error.URLError: <urlopen error ftp error: error_temp('421 There are too many connections from your internet address.',)>

ERROR: test_ftp_no_timeout (test.test_urllib2net.TimeoutTest)

ERROR: test_ftp_timeout (test.test_urllib2net.TimeoutTest)

Originally posted by @vstinner in python/cpython#75066 (comment)