Unable to access Couldera Manager 5 web console after installation - hadoop

Question

I am setting up a hadoop cluster(2.6) on CentOS 7 machine with three nodes, cluster is running fine now. However, I am not able to access the Cloudera manager(5.6) web console after completing the CM installation though its services seems to be running.
Below are my findings, please help me what could be the possible reasons:
All process are up and running !
[root#vm-txxxxxx1 ~]# jps
27978 ResourceManager
15368 Main
27052 Jps
27400 DataNode
27639 SecondaryNameNode
28106 NodeManager
27258 NameNode
Firewall stopped
[root#vm-txxxxx1 ~]# service iptables stop
Redirecting to /bin/systemctl stop iptables.service
[root#vm-txxxxxx1 ~]# service iptabes status
Redirecting to /bin/systemctl status iptabes.service
iptabes.service
Loaded: not-found (Reason: No such file or directory)
Active: inactive (dead)
Mar 24 19:24:05 vm-txxxxx1 systemd[1]: Stopped IPv4 firewall with iptables.
Listening on port 7180 and tested the same locally
[root#vm-txxxxxx1 ~]# netstat -tulpn | grep 7180
tcp 0 0 0.0.0.0:7180 0.0.0.0:* LISTEN 15368/java
[root#vm-txxxxx1 ~]# telnet localhost 7180
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
SELINUX Disabled:
[root#vm-txxxxxx1 ~]# getenforce
Disabled
Hostfile entries
[root#vm-txxxxxx1 ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4
172.16.xx.x1 vm-txxxxxx1
172.16.xx.x2 vm-xxxxxxx2
172.16.xx.x4 del1-vm-poc04
Verify if Cloudera Manager is running:
[root#vm-txxxxxx1 ~]# service cloudera-scm-server status
cloudera-scm-server.service - LSB: Cloudera SCM Server
Loaded: loaded (/etc/rc.d/init.d/cloudera-scm-server)
Active: active (exited) since Tue 2016-03-22 17:09:55 IST; 2 days ago
Process: 15344 ExecStart=/etc/rc.d/init.d/cloudera-scm-server start (code=exited, status=0/SUCCESS)
Mar 22 17:09:50 vm-txxxxxx1 systemd[1]: Starting LSB: Cloudera SCM Server...
Mar 22 17:09:50 vm-txxxxx1 su[15366]: (to cloudera-scm) root on none
Mar 22 17:09:55 vm-txxxxxx1 cloudera-scm-server[15344]: Starting cloudera-scm-server:...]
Mar 22 17:09:55 vm-txxxxxx1 systemd[1]: Started LSB: Cloudera SCM Server.
Hint: Some lines were ellipsized, use -l to show in full.
Below are the lines from Cloudera servers logs
[root#vm-txxxxx1 ~]# tail -f /var/log/cloudera-scm-server/cloudera-scm-server.log
2016-03-24 18:21:00,398 INFO StaleEntityEviction:com.cloudera.server.cmf.StaleEntityEvictionThread: Reaped total of 0 deleted commands
2016-03-24 18:21:00,400 INFO StaleEntityEviction:com.cloudera.server.cmf.StaleEntityEvictionThread: Found no commands older than 2014-03-25T12:51:00.399Z to reap.
2016-03-24 18:21:00,400 INFO StaleEntityEviction:com.cloudera.server.cmf.StaleEntityEvictionThread: Wizard is active, not reaping scanners or configurators
I am accessing the Cloudera Manager page http://172.16.xx.1x:7180
at the end it says "The connection has timeout", it looks like my http request is not able to reach out to the server, that's why nothing comes up in the logs. Please suggest if I am missing something.
Thanks in advance!
#Havnar: Thanks for the suggestion, I am confirming SSL is not enabled now
and sharing the curl result.
[root#vm-txxxx1 ~]# curl -i -u 'admin:admin' http://localhost:7180/api/v1/tools/echo
HTTP/1.1 200 OK
Expires: Thu, 01-Jan-1970 00:00:00 GMT
Set-Cookie: CLOUDERA_MANAGER_SESSIONID=1etaj5o42vprlndf43ua7rbaf;Path=/;HttpOnly
Content-Type: application/json
Date: Fri, 25 Mar 2016 05:50:36 GMT
Transfer-Encoding: chunked
Server: Jetty(6.1.26.cloudera.4)
{
"message" : "Hello, World!"
I tried stop and restarted the cloudera service, nothing find suspicious, there was one warning which is looking little bit suspicious, search them google, nothing looks relevant.
[root#vm-txxxxx1 ~]# vi /var/log/cloudera-scm-server/cloudera-scm-server.log
2016-03-24 20:22:29,002 WARN main:org.hibernate.cache.ehcache.AbstractEhcacheRegionFactory: HHH020003: Could not find a specific ehcache configuration for cache named [org.hibernate.cache.internal.StandardQueryCache]; using defaults.
2016-03-24 20:22:28,581 INFO main:org.hibernate.engine.jdbc.internal.LobCreatorBuilder: HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
#Havnar : I didn't get what do you meant by "try a cat on the machine running the CM", let me know if anything else need to be checked.
Thanks