I'm experiencing a nasty IPS update error in one customer environment on R81.20 that started in July and couldn't be solved together with TAC yet.
The management successfully downloads the IPS update package and gets stuck at 10% trying to perform the update:

After 5 minutes this error is shown:

I already set up a test appliance in my lab, imported the management configuration and got the same result with this configuration.
Looks like a damaged IPS database to me.
I first thought about sk87960, but it's not valid for R8x environments.
I already checked this:
- name resolution on management
- internet access
- NAT configuration
- firewall logs
- disk space
- HTTPS inspection
- proxy configuration
- threat prevention policy
- drop debug entries
- valid contracts installed
- eval license installed
- deployment agent updated
- leading threat prevention rule for the security management with Anti-Virus, Anti-Bot & Threat Emulation unchecked
- deactivated outbound IPS -> solved update issues for App Control & URL filtering while IPS updates still fail
Any ideas?