SonarQube server [http://localhost:9001] can not be reached (Already check all the previous Q. on stackoverflow) - sonarqube

Question

I am getting below error after running command sonar-scanner. My scanner version is sonar-scanner-2.6.1, sonarqube version is sonarqube5.4, java version "1.8.0_161",Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
,Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)
I have also try with other ports like 9001, 9002 but it is still not workig.
INFO: Scanner configuration file: /opt/sonar-scanner-2.6.1/conf/sonar-scanner.properties
INFO: Project root configuration file: /home/parth-favcy/favcy/favcy/value-x/sonar-project.properties
INFO: SonarQube Scanner 2.6.1
INFO: Java 1.8.0_161 Oracle Corporation (64-bit)
INFO: Linux 4.13.0-36-generic amd64
INFO: User cache: /home/parth-favcy/.sonar/cache
ERROR: SonarQube server [http://localhost:9001] can not be reached
INFO: ------------------------------------------------------------------------
INFO: EXECUTION FAILURE
INFO: ------------------------------------------------------------------------
INFO: Total time: 0.373s
INFO: Final Memory: 3M/119M
INFO: ------------------------------------------------------------------------
ERROR: Error during SonarQube Scanner execution
ERROR: Unable to execute SonarQube
ERROR: Caused by: Fail to download libraries from server
ERROR: Caused by: Connection refused (Connection refused)
ERROR:
ERROR: To see the full stack trace of the errors, re-run SonarQube Scanner with the -e switch.
ERROR: Re-run SonarQube Scanner using the -X switch to enable full debug logging.
parth-favcy#parthfavcy-HP-Notebook:~/favcy/favcy/value-x$ /opt/sonar-scanner-2.6.1/bin/sonar-scanner -X
INFO: Scanner configuration file: /opt/sonar-scanner-2.6.1/conf/sonar-scanner.properties
INFO: Project root configuration file: /home/parth-favcy/favcy/favcy/value-x/sonar-project.properties
INFO: SonarQube Scanner 2.6.1
INFO: Java 1.8.0_161 Oracle Corporation (64-bit)
INFO: Linux 4.13.0-36-generic amd64
INFO: User cache: /home/parth-favcy/.sonar/cache
DEBUG: Extract sonar-scanner-api-batch in temp...
DEBUG: Get bootstrap index...
DEBUG: Download: http://localhost:9001/batch_bootstrap/index
ERROR: SonarQube server [http://localhost:9001] can not be reached
INFO: ------------------------------------------------------------------------
INFO: EXECUTION FAILURE
INFO: ------------------------------------------------------------------------
INFO: Total time: 0.341s
INFO: Final Memory: 3M/119M
INFO: ------------------------------------------------------------------------
ERROR: Error during SonarQube Scanner execution
org.sonarsource.scanner.api.internal.ScannerException: Unable to execute SonarQube
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:84)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:71)
at java.security.AccessController.doPrivileged(Native Method)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:71)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:67)
at org.sonarsource.scanner.api.EmbeddedScanner.doStart(EmbeddedScanner.java:218)
at org.sonarsource.scanner.api.EmbeddedScanner.start(EmbeddedScanner.java:156)
at org.sonarsource.scanner.cli.Main.execute(Main.java:70)
at org.sonarsource.scanner.cli.Main.main(Main.java:60)
Caused by: java.lang.IllegalStateException: Fail to download libraries from server
at org.sonarsource.scanner.api.internal.Jars.downloadFiles(Jars.java:93)
at org.sonarsource.scanner.api.internal.Jars.download(Jars.java:70)
at org.sonarsource.scanner.api.internal.JarDownloader.download(JarDownloader.java:39)
at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:75)
... 8 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.Platform.connectSocket(Platform.java:101)
at org.sonarsource.scanner.api.internal.shaded.okhttp.Connection.connectSocket(Connection.java:198)
at org.sonarsource.scanner.api.internal.shaded.okhttp.Connection.connect(Connection.java:172)
at org.sonarsource.scanner.api.internal.shaded.okhttp.Connection.connectAndSetOwner(Connection.java:358)
at org.sonarsource.scanner.api.internal.shaded.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:117)
at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:329)
at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:246)
at org.sonarsource.scanner.api.internal.shaded.okhttp.Call.getResponse(Call.java:276)
at org.sonarsource.scanner.api.internal.shaded.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:234)
at org.sonarsource.scanner.api.internal.shaded.okhttp.Call.getResponseWithInterceptorChain(Call.java:196)
at org.sonarsource.scanner.api.internal.shaded.okhttp.Call.execute(Call.java:79)
at org.sonarsource.scanner.api.internal.ServerConnection.callUrl(ServerConnection.java:114)
at org.sonarsource.scanner.api.internal.ServerConnection.downloadString(ServerConnection.java:99)
at org.sonarsource.scanner.api.internal.Jars.downloadFiles(Jars.java:78)
... 11 more
----------------------------------------------------------------------
My iptable rule :
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy DROP)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain DOCKER (0 references)
target prot opt source destination
Chain DOCKER-ISOLATION (0 references)
target prot opt source destination
Chain DOCKER-USER (0 references)
target prot opt source destination
---------------------------------------------------------
Sonar Properties file :
#Configure here general information about the environment, such as SonarQube DB details for example
#No information about specific project should appear here
#----- Default SonarQube server
sonar.host.url=http://localhost:9001
#----- Default source code encoding
#sonar.sourceEncoding=UTF-8
#----- Global database settings (not used for SonarQube 5.2+)
#sonar.jdbc.username=sonar
#sonar.jdbc.password=sonar
#----- PostgreSQL
#sonar.jdbc.url=jdbc:postgresql://localhost/sonar
#----- MySQL
#sonar.jdbc.url=jdbc:mysql://localhost:3306/sonar?useUnicode=true&characterEncoding=utf8
#----- Oracle
#sonar.jdbc.url=jdbc:oracle:thin:#localhost/XE
#----- Microsoft SQLServer
#sonar.jdbc.url=jdbc:jtds:sqlserver://localhost/sonar;SelectMethod=Cursor
sonar.properties file : https://drive.google.com/open?id=1Dc1sj0_lcGpQ41NoFmRZH593ww-4Bf_F