If using a remote access, sometimes an RPC entry point is not available, and currently we just end up with a raw: error: unknown procedure: xxx error, while this should be more cleanly reported as an unsupported entry point like for local access, e.g when calling an older RHEL-5.3 without patch paphio:~/libvirt -> tools/virsh --connect xen+ssh://root@test3 dominfo test5 Id: 1 Name: test5 UUID: 62cd4e2e-5117-e4ba-2dbf-68a37031c3e4 OS Type: linux State: idle CPU(s): 1 CPU time: 254.5s Max memory: 524288 kB Used memory: 524108 kB error: unknown procedure: 122 with patch paphio:~/libvirt -> tools/virsh --connect xen+ssh://root@test3 dominfo test5 Id: 1 Name: test5 UUID: 62cd4e2e-5117-e4ba-2dbf-68a37031c3e4 OS Type: linux State: idle CPU(s): 1 CPU time: 254.6s Max memory: 524288 kB Used memory: 524080 kB paphio:~/libvirt -> the application knows that some feature may not be avilable but expects the VIR_ERR_NO_SUPPORT to be reported, not an internal RPC problem, I also noticed that we do "%s", thiscall->err.message ? *thiscall->err.message : NULL); for passing the error message, which is a sure way to crash if there is no error message and changing this to "%s", thiscall->err.message ? *thiscall->err.message : "unknown"); I expect the server to always return an error message in practice, but this need fixing. Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel(a)veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/