Can not access tomcat via port 8443 in AWS Singapore when using Singapore IP - ssl

Question

I follow this tutorial to install Mifosx with tomcat7 in a debian EC3 in Singapore region.
Then I follow this to isntall a free startSSL for my server.
Everything is ok for me in Vietnam (already tried to change IP, change PC... still ok)
But other countries (even my friend in Singapore and a Sing windows VPS) can not access to the VPS through both
https://xxx.xxx.xxx.xxx:8443
and
https://mifos.domain.com:8443.
It just stuck at loading.
I've check all the log file under /var/log/* and /var/log/tomcat7/*, everything ok when I access from Vietnam, but nothing even error happen when I try from other countries
Also checked and allow port 8443 in iptables
admin#ip-172-31-1-14:~$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:8443
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
this is a server setting:
<?xml version='1.0' encoding='utf-8'?>
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.core.JasperListener" />
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
<GlobalNamingResources>
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml"
/>
<Resource type="javax.sql.DataSource"
name="jdbc/mifosplatform-tenants"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/mifosplatform-tenants"
username="root"
password="zxcasdqwe123"
initialSize="3"
maxActive="10"
maxIdle="6"
minIdle="3"
validationQuery="SELECT 1"
testOnBorrow="true"
testOnReturn="true"
testWhileIdle="true"
timeBetweenEvictionRunsMillis="30000"
minEvictableIdleTimeMillis="60000"
logAbandoned="true"
suspectTimeout="60"
/>
</GlobalNamingResources>
<Service name="Catalina">
<Connector protocol="org.apache.coyote.http11.Http11Protocol"
port="8443" maxThreads="200"
scheme="https" secure="true"
SSLEnabled="true" sslProtocol="TLS"
keystoreFile="/usr/share/mifosx/checkthecrowd.jks"
keystorePass="zxcasdqwe123"
clientAuth="false"
URIEncoding="UTF-8"
compression="force"
compressableMimeType="text/html,text/xml,text/plain,text/javascript,text/css"/>
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log." suffix=".log"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
</Server>
some extra stuffs I've tried without luck:
change to the default self signed certification
reboot vps
change Elastic IP
change hostname and domain
PS: I've an old server which had an mifos and tomcat installed worked well for all country.

Answer 1

8443 is not a standard HTTPS port. There might be an issue of Singapore ISP blocking outgoing connections to non-standard ports. This is my suggestion. Use the standard HTTPS port. 443 and see if there are still issues.