Web Security Manager
There is no hardcoded limit to sites or SSL certificates, but it is a function of available resources. Based on experience in the field, we would strongly recommend not going above ~100 sites on a single Alert Logic® Web Security Manager instance without careful, incremental testing.
Web Security Manager Premier
There is no hard-coded limit to sites or SSL certificates, but a limit may exist based on resource availability (mem/CPU). Alert Logic recommends not going above ~100 sites on a single Alert Logic® Web Security Manager Premier™ (WSMP) instance. Beyond that, you should test before going into production. Use the 100 site limit as a guide for sizing, but not a strict number. For example, if you want to scale 200 sites, plan on utilizing two WSMP instances.