Zabbix frontend broken after upgrade to version 3.4 from 3.2

[zaki4594]

I just upgraded my Zabbix server on Centos7 and when I go to the frontend, it's not working like it should be. Everything's broken. For example, on the Dashboard, I have something like the picture attached below. I think the problem comes from the PHP but I'm not too sure about this. Can someone explain to me please?

[allexpetrov]

Hi,

I believe this was already discussed hundred of times by the community. Try to clean the cache and this should solve the issue.

Regards,
Alex!

[zaki4594]

Thanks that's solved the problem

[mellis]

Agents are unreaachable after the 3.4 upgrade

I have been looking for an answer, but so far I only read the bug was fixed. I have upgraded to 3.4.6 but after 30 mins the dashboard shows the agents are unreachable. When you look close in the latest data screen you see where the timestamps are not updating and there are gaps in the graphs. But there are no errors in the logs and in the host data, it shows they are connected.

[PingPong93]

Wait for 24 hour.

I have faced this problem last time when upgrading my servers from 3.0 -> 3.4 and 3.2 -> 3.4. I waited approximately 24 hours, and it solved the dashboard problem on its own.

Waiting might work for you if no other solution. Work for me tho. No need to clean cache or anything.

[mellis]

My problem lasted for 3 days. I have exported the host and templates and remove the install. This install was an upgrade from several versions from 2.2 over several years. I was going to do a clean 3.4 install and see how that works.

Thanks you for the reply.