Starting with zabbix web

[igoreslein]

Hello,
I am new to zabbix and I started with an easy net for my tests, there is a zabbix server, with an agent in itself and two more endpoints only with an agent installed.
The thing is that when I try to monitor and get info of them I am not having any luck, the web interface only detects one of the agents and it says that is unreachable, the other one is not even detected.
I tried to do some requests from the server, using the command zabbix_get -s (the agent installed pc) -p 10050 -k agent.ping and in both cases the response is 1, what i understand as an ok response.
I am new to this so I may have problems in the configuration file, I think that could be the " hostname " option, what have to go there? The agent installed pc or the zabbix server hostname.
The other options do not seem to be the failure.
Also the version I am using is 3.2, the repository of 3.4 failed for me, may I start again and reinstall the 3.4 or I can continue with 3.2?

[igoreslein]

The server also is not running on the web or that is what it says, if I check this at the server itself in the command line the server seems running perfectly.
I checked for this at the forums and seems to be a common trouble, but can not solve. I am sure that this is the main problem affecting the other not to work but the very first time I tried to check for agents,
it was working and did not change anything since. I am desperate and really thinking to restart all the project reinstalling zabbix and trying again from zero.