I try to set the base url to the following value http://bmi_jira.belfla.vonet.be
This gives the error message 'You must set a valid base URL'
I found on the web the resolved issue https://jira.atlassian.com/browse/JRA-27777 with a work around to use the ip address in the URL.
This is however not a valid workaround for us. Because of restrictions on the network we can only reach the server with the above
mentionned address, ip addresses are not allowed.
The impact is that the mails contain now invalid links for us.
I suspect "can only reach it via address, ip addresses are not allowed" is the root of the problem.
A name in a url is just that, a name. There's a DNS server somewhere saying "when a user types in xyz in the url, then what they mean is ip-addres a.b.c.d". The name is a convenience that gets changed to a real address by the network.
If you can't reach a service via it's IP address, then there's two things that may be happening - first, your network is broken, or secondly, something between you and the server is doing some masking/proxying/redirecting type tricks. That would mean the IP address that you have tried with is genuinely invalid, but there is a valid, reachable IP address behind the trick service.
Edit - sorry, I missed a bit of detail and got dragged into a meeting
When you put a base url in, the server is going off and checking that it is a valid base url. It uses standard http or https to do this, and a requirement of these is that the DNS name resolves to a valid IP address.
So, you have three options
The basic test for all of these is nslookup. On a command line, try "nslookup bmi_jira.belfla.vonet.be". If it does not return an IP address, then you need to get your network people to fix it. If it does, then try http://ipaddress in your browser. If that fails, then you need to get your network people to fix it.
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