To ensure your machine can "see" the 1800 Notfiy.com SFTP server, please install this free tool called NMAP.
Note: You'll need admin rights to be able to install software on your computer.
STEP 1: Install NMAP for your computer
1.1 Go to: https://nmap.org/download.html
1.2 Locate and install the correct version for your computer's operating system.
For example, for Windows, at the time of publishing this article, this was the correct version:
1.3 Once downloaded, install the program.
STEP 2: Open NMAP on your Computer
1. You may have a desktop icon, but if not, you can search for NMAP and then click on it.
1.2 Type in this Target - sftp3.1800notify.com
1.3 Select "QuickScan" from the drop down list.
1.4 Add this to the end of the Command: -Pn (to skip pinging the server) so the "Command" should look like this:
1.5 Click the Scan button to start the scan.
1.6 The correct result you should see is shown below in the results below - this means the host is open to Port 22 - SFTP protocol and can be 'seen' from your computer.
Nmap scan report for sftp3.1800notify.com (22.214.171.124)
Host is up (0.032s latency).
rDNS record for 126.96.36.199: ec2-35-153-88-41.compute-1.amazonaws.com
Not shown: 999 filtered tcp ports (no-response)
PORT STATE SERVICE
22/tcp open ssh
If you see 100 or 1000 closed ports and no Open ports for port 22, then for some reason your computer is being blocked.
STEP 3: WHAT TO DO - SEND IP - WHITELISTING
3.1 Figure out your public IP address and email it to the person you are working with at 1800 Notify.
Type in "What is my IP" into a google search box to find your IP like this:
3.2 Request your 1800 Notify contact to white list your IP address and the IP address of your SFTP server(s).
STEP 4: ASK YOUR OWN NETWORK SECURITY TEAM ABOUT BLOCKING
4.1 Ask your network security team if they might be blocking your access to sftp3.1800notify.com (188.8.131.52)
4.2 Ask your Network team to allow communication with sftp3.1800notify.com (184.108.40.206)