One of my servers failed to install a few updates. I found that the disk had filled up. I deleted files out of c:\windows\temp, and I also deleted files out of c:\windows\ccm\ccmcache. This probably caused my current problem. Now when I retry the updates, it starts to download and immediately fails. CAS.log file says:
Requesting content f4673831-5555-474f-9eb0-9ac53fa09044.1, size(KB) 0, under context System with priority Foreground
Saved Content ID Mapping f4673831-5555-474f-9eb0-9ac53fa09044.1, C:\Windows\ccmcache\30
Content for f4673831-5555-474f-9eb0-9ac53fa09044.1 was found in cache
Cache is in Use. DeleteCacheItem cannot proceed.
No content source for given handle found
I checked the ccmcache folder, and it is empty. On google, I found a vbs script to force clearing this cache. I downloaded, and ran as administrator. It said success, but in the CAS.log it says:
CacheManager.DeleteCacheItem failed with 0x87d01203
Cache is in Use. DeleteCacheItem cannot proceed.