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    This is a bug that happens in Slide in versions 4.2.0 and before. Update to 4.2.2 or further to fix it.

Solutions on the web

via GitHub by jdef
, 1 year ago
zk-1.zk: unknown error
via Stack Overflow by KajMagnus
, 2 years ago
dbltest.com.dbl.spamhaus.org: unknown error
via GitHub by tomasbjerre
, 1 year ago
local_sercer: unknown error
via Coderanch by Mandar Khire, 1 year ago
time-a.nist.gov: unknown error
via GitHub by hmnasr
, 1 year ago
go.urbanairship.com: unknown error
via Stack Overflow by LocustOnMeadow
, 7 months ago
java.net.UnknownHostException: zk-1.zk: unknown error	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)	at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)	at java.net.InetAddress.getAllByName0(InetAddress.java:1276)	at java.net.InetAddress.getAllByName(InetAddress.java:1192)	at java.net.InetAddress.getAllByName(InetAddress.java:1126)	at org.apache.zookeeper.client.StaticHostProvider.resolveAndShuffle(StaticHostProvider.java:116)	at org.apache.zookeeper.client.StaticHostProvider.(StaticHostProvider.java:77)	at org.apache.zookeeper.ZooKeeper.(ZooKeeper.java:718)