The requested monitor rule (xxxx) can only be applied to pool members.

Interesting; I think I have found the issue.

I am new to these types of appliances, so forgive me if this is supposed to be common knowledge (I am learning as I go), but I get this error when setting the Address-Type to either ATYPE_STAR_ADDRESS or ATYPE_EXPLICIT_ADDRESS.

When I use ATYPE_STAR_ADDRESS_STAR_PORT, ATYPE_STAR_ADDRESS_EXPLICIT_PORT or ATYPE_EXPLICIT_ADDRESS_EXPLICIT_PORT, both calls (yours as well as mine) work.

R.