So as promised, some testing with system monitor set to trace DNS requests by the IP Office.
With DNS switched off (and now I know how upset a Windows server gets when it can get DNS responses) and DNS not set in the IP Office config, we see nothing in monitor (no surprise, it has nowhere to go) and no response in the browser.
With DNS set in the IP Office but DNS server still off - we see the IP Office make its request to verify the address and then the invalid FQDN response in the browser.
With DNS set in the IP Office and the DNS server back on (phew) - we see quite a long conversation (see below) where the IP Office queries both the DNS servers authority for the domain and then 2 requests validating the FQDN used to access the IP Office.
Conclusion: Name access to the IP Office only works if the system is configured with a DNS server and that DNS server validates the name.
Question: Why do you want name access when, if we find a workaround for your PC other than installing a local DNS, it will only work for your PC?
[pre]07:25:18 277442mS PRN: Monitor Status S-Edition Primary Select 11.0.4.1.0 build 11
07:25:18 277442mS PRN: Linux Whoo
07:25:22 281347mS PRN: IPOKeepaliveTask::Main sending keepalives at 5000 ms
07:25:23 282039mS DNS: Local Query example.com to 192.168.0.50
07:25:23 282040mS DNS: Local Response example.com result=8580:questions=1,answer RRs=0,authority RRs=1,additional RRs=0
07:25:23 282964mS DNS: Local Query storm1.example.com to 192.168.0.50
07:25:23 282964mS DNS: Local Response storm1.example.com result=8580:questions=1,answer RRs=1,authority RRs=1,additional RRs=1
07:25:23 282964mS DNS: RR: QType=0001 QClass=0001 ttl=86400 name=storm1.example.com target= ipaddr=192.168.0.180
07:25:23 282964mS DNS: AUTH: QType=0002 QClass=0001 ttl=86400 name=example.com target=dns.example.com ipaddr=0.0.0.0
07:25:23 282965mS DNS: ADD: QType=0001 QClass=0001 ttl=86400 name=dns.example.com target= ipaddr=192.168.0.50
07:25:24 283635mS DNS: storm1.example.com DNS - refreshing: have valid (not used) result
07:25:24 283884mS DNS: Local Query storm1.example.com to 192.168.0.50
07:25:24 283884mS DNS: Local Response storm1.example.com result=8580:questions=1,answer RRs=1,authority RRs=1,additional RRs=1
07:25:24 283884mS DNS: RR: QType=0001 QClass=0001 ttl=86400 name=storm1.example.com target= ipaddr=192.168.0.180
07:25:24 283884mS DNS: AUTH: QType=0002 QClass=0001 ttl=86400 name=example.com target=dns.example.com ipaddr=0.0.0.0
07:25:24 283884mS DNS: ADD: QType=0001 QClass=0001 ttl=86400 name=dns.example.com target= ipaddr=192.168.0.50
07:25:25 284635mS DNS: storm1.example.com DNS - refreshing: have valid (not used) result[/pre]
Stuck in a never ending cycle of file copying.