Connect requests for unknown channels don't trigger a client-side search

[anjohnson]

When a CA name-server sits in front of a CA Gateway, clients that use the name-server don't make new connections to PVs the gateway should be serving, it seems that the gateway only searches for and sets up a new VC for PV names that come in from a UDP search.

Our name-server knows the names published by a set of IOCs that live behind our "RBB" gateway, which has its client side on the RBB subnet and its server side on our "EP" subnet. CA clients from machines on the EP subnet can connect to the RBB IOC PVs just fine through the gateway. However we have CA clients in our "MCR" subnet which are being told (correctly) by the name-server to contact the RBB gateway for PVs from those IOCs, and some connect fine but others don't. The PVs that don't connect are the ones that no client in the EP subnet has tried to connect to yet, so there is no VC for them in the gateway. Running a caget for those PVs on an EP client sends a broadcast search which triggers the creation of the VC for that PV, and the MCR clients can then connect.

I plan to have the RBB gateway serve the MCR subnet as well to work around the problem so this isn't urgent, when I can find someone with spare time I'll try to have them take a look to see if it can be resolved though.