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Chapter 4 Troubleshooting
Error Message when Viewing a Report
Cisco SCA BB SNMP Real Time Monitoring User Guide
4-2 OL-12491-01
2. Cron did not invoke MRTG
a) Verify Cron is configured correctly—Check the MRTG invocation command for the
specific SCE platform is correct.
b) If using PyCron, try running MRTG from PyCron GUI and verify it completes with return
code 0
Problem
Apparent Error Message: viewing a report returns with an error message The server
encountered an internal error or misconfiguration and was unable
to complete your request.
Cause
This error message appears on Unix/Linux systems if the web server user does not have execution
permissions on the SCE platform's report CGI files.
Solution
Add execution permissions to all users to all .cgi files.
Problem
Apparent Error Message: viewing a report returns with an error message ERROR: Opening
'<report image filename>.png' for write: Permission denied.
Cause
This error message appears on Unix/Linux systems if the web server user does not have writing
permissions on the SCE platform's directory in the RTM directory.
Solution
Add write permissions to all users to all SCE directories in the RTM directory.
Problem
Apparent Error Message: viewing a report returns with an error message ERROR: opening
'<RRD archive name>.rrd': Permission denied.
Cause
This error message appears on Unix/Linux systems if the web server user does not have reading
permissions on RRD archive files in the SCE platform's directory.
Solution
Add read permissions to all users to all RRD archive files. Note that the example crontab.txt file
created by the rtmcmd for Unix/Linux systems contains a permissions change command for each
monitored SCE. The permissions change command follows the MRTG invocation.