My expectation is that you're sitting behind corporate proxy. Browser uses proxy to connect to the Internet and JMeter doesn't.
If this is the case you can "tell" JMeter to use the same proxy server as browser does via the following command-line arguments:
-H, --proxyHost <argument>
Set a proxy server for JMeter to use
-P, --proxyPort <argument>
Set proxy server port for JMeter to use
-N, --nonProxyHosts <argument>
Set nonproxy host list (e.g. *.apache.org|localhost)
-u, --username <argument>
Set username for proxy server that JMeter is to use
-a, --password <argument>
Set password for proxy server that JMeter is to use
See