will you give any response ?
i want to understand how to setup cache directory on windows server which has cacti installed on it to view realtime graphs.
Is this "Cache" folder for the "Realtime" plugin by chance?
If so, you need to set the permissions on the folder so that the WAMP/IIS server can write to the C:\your\rrd\cache\path (whatever it may be).
Thanks for getting back to me. So the cache directory is obviously set properly...You said you gave the IIS account permission to the directory, so that's good. The next thing you need to figure out is, whether the process that writes the RRD files has permissions to update that directory.
One thing you can try to see if this is a permissions issue is to * TEMPORARILY * set the permissions on C:\cache to "everyone" with FULL rights. That should tell you straight away if it's an issue with permissions. Additionally, you'll want to check your Windows Logs for both System and IIS logs to see if anything jumps out. It's been years since I've managed a Windows Cacti box, but if memory serves, issues with polling or with directory permissions will show up there.