Unable to connect to slack from elastic notification alerting

Elastic Stack Elasticsearch
1

I have an issue connecting to slack from elasticsearch action notifications.
to access https from the node, I need to use a proxy i.e.
if I do a

[]# curl -v  https://hooks.slack.com -x http://proxy.domain.com:5050 
* About to connect() to proxy proxy.domain.com port 5050 (#0)
*   Trying (IP)
* Connected to proxy.domain.com (ip) port 5050 (#0)
* Establish HHTP proxy tunnel to hooks.slack.co:443
> CONNECT hooks.slack.com:443

It says HTTP/1.1 200 Connection Established

In my Action I specify the proxy:

"actions":{
    "slack_1": {
      "slack":{
         "proxy":{
            "host": "http://proxy.domain.com"
             "port": 5050
         }
       }
    }
   }
}

But I get the following error:

[2020-07-24T18:33:17,736][ERROR][o.e.x.w.n.s.SlackService ] [elastic] failed to execute slack api http request
java.net.UnknownHostException: http://proxy.domain.com: Name or service not known
       at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[?:?]
       at java.net.InetAddress$PlatformNameService.lookupAllHostAddr(InetAddress.java:930) ~[?:?]
       at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1499) ~[?:?]
       at java.net.InetAddress$NameServiceAddresses.get(InetAddress.java:849) ~[?:?]
       at java.net.InetAddress.getAllByName0(InetAddress.java:1489) ~[?:?]
       at java.net.InetAddress.getAllByName(InetAddress.java:1348) ~[?:?]
       at java.net.InetAddress.getAllByName(InetAddress.java:1282) ~[?:?]
       at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:112) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:374) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:401) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185) ~[httpclient-4.5.10.jar:4.5.10]
       at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72) ~[httpclient-4.5.10.jar:4.5.10]

Looks to me that is not even trying the port. my web hook I'm specifying it in the key store.
Any ideas what is wrong?

2

What Elasticsearch version are you trying this on?

3

Changing it to

"host": "proxy.domain.com"

worked

4

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