Troubleshooting Dell Boomi US Production Atom Cloud connectivity issues after the relocation

Document created by sheng_liao462475 Employee on Oct 5, 2018Last modified by sheng_liao462475 Employee on Oct 5, 2018
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How to identify what IP address the DNS server resolves to

To identify what IP address your ISP's DNS servers are resolving the or DNS entry to, you can use one of the following tools, depending on your operating system.


Windows Systems:  nslookup

Note:  These instructions are for Windows 10. Other Windows operating systems might handle launching a command prompt differently.

  • To open a command prompt, right-click the Windows Button and click Run.
  • Type cmd and press Enter.
  • In the command prompt window, type nslookup

If the old IP address is present, your ISP's DNS server is ignoring the TTL value.  The old and new IP addresses are listed here.

Here's an example response from nslookup with the old IP address :  

Non-authoritative answer:



Linux/Mac systems: dig

  • Launch a terminal window in Mac or Linux.
  • macOS:
  • Ubuntu: Open the Dash by clicking the Ubuntu icon, type "terminal" and select the Terminal application. Alternatively, use the keyboard shortcut Ctrl-Alt+T.
  • Type dig

The ANSWER SECTION: includes the DNS name and the IP address. This example response shows the old IP address in blue bold.

; <<>> DiG 9.9.5-3ubuntu0.13-Ubuntu <<>>

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27982

;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3



; EDNS: version: 0, flags:; udp: 4096


;             IN A




If the nslookup commands continue to show the old IP address for or, please follow the following suggestions to resolve a DNS issue:


Suggestion #1:  Flush your device's DNS cache

If your DNS resolves or to the old IP address, you can attempt to perform a DNS cache flush on your local system. A flush will work only if your local system cached the old IP address. See below for How to identify what IP address the DNS server resolves to.

Steps for flushing DNS cache for various operating systems can be found here:

If this does not resolve your connectivity issues, proceed to the next suggestion.


Suggestion #2:  Contact your local IT support

If your ISP's DNS server is resolving to one of the new IP addresses but you still cannot connect to or, the problem might be firewall- or proxy-related. in that case, your local IT support team is best equipped to investigate and resolve your connectivity problem.  

If the DNS entry points to the correct IP address, then the issue is most likely on your firewall.  Please ensure the new IP addresses, which are presented in the Community Post are whitelisted on your firewall.