Issue
IIS is either not functioning or running slow.
Cause
Several situations can be the cause. Typically traffic to the WSVulnerability web service is the culprit.
Try browsing from a client to http://yourcoreservername/wsvulnerabilitycore/vulcore.asmx
- Database is not keeping up with requests.
- Core server is overwhelmed due to excessive traffic often caused by too many various tasks being run at once.
- Check the schedule for Inventory, Security and Patch Scan, Frequent Security and Patch Scan, Etc.
- An errant client or clients are spamming the core with information. The VDIR hits by IP query in Log Parser can be quite helpful to identify any outliers that are causing high IIS traffic.
Resolution
Look in Task Manager on the Core Server, see which W3WP process(es) are causing high cpu and or memory usage. Turn on "Command Line" in Task Manager by right clicking a column and selecting "Select columns".
Troubleshoot with the following links:
Download Log Parser from Microsoft and Log Parser Studio.
Log Parser will install.
Log Parser studio you will just unzip to a directory. I suggest you pin LPS.EXE to your taskbar and use it for regular IIS troubleshooting.
There are a series of IIS queries that can be quite helpful.
How to Analyze IIS logs using Log Parser and Log Parser Studio
Turn off friendly error messages in Internet Options if using Internet Explorer and browsing to the core. This will give the HTTP error code you may be experiencing.