You need to flush your DNS cache because it seems to be changed but your system did not check that yet!
In lunux the DNS cache is managed by the nscd daemon. You just have to restart this daemon to flush your cache. On most linux operating systems you can use:
For a debian system or equivalent I always use the invoke-rc.d command:
invoke-rc.d nscd restart
This will do the job.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.