Hi Piotr,
As you can ping the IP, but not the FQDN, there are a few of options.
1. Change the FQDN for the vCenter adapter in AOps for IP of vCenter instance. This is the quick and dirty way and least desirable method as it does not resolve underlying DNS issues
In the left pane select Data Sources -> Integration -> Expand vCenter section -> Click on the name of the vCenter adapter you need to modify
Then replace FQDN with IP
2. Modify /etc/hosts file to include IP, FQDN and hostname for vCenter.
Make sure you add it above/below the VAMI block that starts and ends with:
# vROps_EDIT_BEGIN
# vROps_EDIT_END
Anything inside that block is managed by VAMI, and may be reset upon reboot of appliance. This workaround is best use if you cannot resolve the DNS issue yourself in a relatively timely manner.
3. Resolve the underlying DNS issue.
Ensure that both forwards and reverse lookups are ok:
#> nslookup <IP>
#> nslookup <FQDN>
If you do not get a response, but you are aware of working DNS server, you can try:
#> nslookup <IP> <DNS server IP>
#> nslookup <FQDN> <DNS server IP>
This can be used to determine if a DNS server is able to resolve the IP or FQDN, in an attempt to locate a working DNS server.
If nslookup is not able to resolve IP or FQDN. Verify that the DNS server is functioning. Please check with your DNS administrator
If nslookup is only ale to resolve IP, but not FQDN. The DNS server is likely missing the reverse lookup. Please check with your DNS administrator
When you have a working DNS server or need to change the IP for the DNS server, you 'could' make a change in /etc/resolv.conf. Though that is not a persistent change as it will be reset upon reboot.
To make the change persistent in vROps/AOps 8.12 and earlier, follow instructions in KB: https://kb.vmware.com/s/article/2115840
Please note that the change in vAPP options is mandatory and should not be omitted.
There is currently (as of Dec 7th 2023) no KB written for changing DNS for Aria Operations 8.14.
However, you can follow the vAPP option part of https://kb.vmware.com/s/article/2115840 (Option 1 and Option 2 does not work as VAMI tools are not present in PhotonOS 4.0)
We have a KB for Aria Operations for Logs 8.14, and the you can follow step 5 onwards under AOL 8.14 heading: https://kb.vmware.com/s/article/91258
Hope this helps