I've had issues with ISOs mounted on the same data store as the VMs - you could try burning a disk (or connecting to an ISO on your workstation) if this is the case. If not, may just be a bad image.
I have Domain Controller with DNS - 192.168.1.2
During CUCM installation I specified DNS address - 192.168.1.2
I specified 192.168.1.9 for CUCM server with BRIDGED type of network. At the moment CUCM server successfully replies on ping from any PC, but i get this error.
Is it reverse lookup zone which should be configured?
Don't bother with DNS for the lab... You will need a reachable NTP server though. I don't setup DNS in production either - Best Practices state to remove all name associations and use IP addresses. It's one less thing to have to trouble shoot when stuff hits the fan!
Otherwise, yeah, add a static entry on the DNS server.
I skipped the step with Reverse Lookup Zone but now stucked on the step with NTP. Unfortunately both host and guest machines don't have an Internet access. What can be specified as an NTP server?
You can setup your guest's NIC to be bridged with the host's physical NIC. Then spin up GNS3 and drop a cloud and a router on the white board. Configure the cloud with your physical NIC. Connect the cloud to the router. Boot up the router and assign it's interface an IP on the same network as your host's interface. Configure NTP master on the router. Ensure your host can ping the router's interface. Use the router's IP as your NTP server in CUCM install.
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How to fix it?
During CUCM installation I specified DNS address - 192.168.1.2
I specified 192.168.1.9 for CUCM server with BRIDGED type of network. At the moment CUCM server successfully replies on ping from any PC, but i get this error.
Is it reverse lookup zone which should be configured?
Otherwise, yeah, add a static entry on the DNS server.