Symptoms:
When trying to apply a firewall rule filter using a valid source/destination IP as the filtering criteria, the error "Invalid IP mask bits specified. Number of bits provided is 0." is displayed at the top of the firewall section.
![](https://api-broadcomcms-software.wolkenservicedesk.com/attachment/get_attachment_content?uniqueFileId=1512727064545)
the vsm.log will also contain lines similar to these:
2019-08-25 11:01:53.100 CEST WARN http-nio-127.0.0.1-7441-exec-109 RemoteInvocationTraceInterceptor:88 - Processing of VsmHttpInvokerServiceExporter remote call resulted in fatal exception: com.vmware.vshield.firewall.facade.IFirewallUIFacade.getL3Configuration
InvalidNumMaskBitsException: core-services:1427:Invalid IP mask bits specified. Number of bits provided is 0.
Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment