graph_view is blank

[jonasdg]

Hi,

I'm running cacti 1.1.36 on Centos 7 and everything worked fine. Now (a few months later) I noticed that when I try to access the graph_view, nothing is displayed. Only a blank page. Everything else on cacti is working fine, I get notification emails if a device goes down and a weekly report is also nicely dropped in my mailbox (with graph).

The cacti log shows:

2019/06/18 19:50:07 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[3] Thread[1] DS[19]
2019/06/18 19:50:08 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[8] Thread[1] DS[935]
2019/06/18 19:55:02 - POLLER: Poller[1] WARNING: There are '1' detected as overrunning a polling process, please investigate
2019/06/18 19:55:07 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[3] Thread[1] DS[19]
2019/06/18 19:55:09 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[8] Thread[1] DS[935]
2019/06/18 19:55:10 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[10] Thread[1] DS[934]
2019/06/18 19:55:10 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[12] Thread[1] DS[493]
2019/06/18 19:55:15 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[16] Thread[1] DS[941]
2019/06/18 19:55:19 - POLLER: Poller[1] WARNING: Invalid Response(s), Errors[1] Device[21] Thread[1] DS[937]
2019/06/18 19:55:26 - SYSTEM STATS: Time:24.3019 Method:cmd.php Processes:1 Threads:N/A Hosts:26 HostsPerProcess:26 DataSources:2130 RRDsProcessed:1074
2019/06/18 19:55:28 - SYSTEM THOLD STATS: Time:0.2642 Tholds:0 TotalDevices:26 DownDevices:0 NewDownDevices:0
2019/06/18 19:55:28 - SYSTEM MONITOR STATS: Time:0.2 Reboots:0 DownDevices:0 Notifications:0 Purges:0

Any idea how to troubleshoot this?
Thx.

Regards,
Jonas

[netniV]

Check the datasources and use snmpwalk for each of the ids shown in the log.