1. Login to ADC server
2. Ensure to enable appfw feature.
3. Ensure auto-update URL is configured and auto-update is enabled.
4. Ensure that the ADC has connectivity to auto-update URL
5. If any proxy present, please configure the proxy ip and port. If no proxy is present, go to next step.
6. Go to URL shell and execute the following command:
Size of V90 signatures has been decreased to < 2MB, which will kill the issue, in other words, there will be no this issue in future upgrade(or auto upgrade) to V90 onwards.