Site accessibility & firewall considerations (Error 404 or Load Failed)

Applies to:

Velixo NX
Any ERP

Overview

Modern Excel add-ins cannot make a direct connection to your ERP system due to the browser engine restrictions for cross-origin requests. In Excel for Mac and Excel Desktop for Windows, MS Office utilizes a Safari or Edge-based browser engine behind the scenes.

Therefore, Velixo NX uses a secure proxy server to facilitate the connection to your ERP system. The proxy never caches or stores your ERP data, it is used solely for authentication and request pass-through.

However, the fact that such a proxy server exists has two important implications:

Any ERP site that you connect to must be accessible over the public internet, with no VPN requirement
If your ERP host uses a firewall, it is important to allow-list not just your end users' IP addresses, but also those of Velixo NX's proxy servers

IP ranges and addresses for allow-listing:

^{173.245.48.0/20}

^{103.21.244.0/22}

^{103.22.200.0/22}

^{103.31.4.0/22}

^{141.101.64.0/18}

^{108.162.192.0/18}

^{190.93.240.0/20}

^{188.114.96.0/20}

^{197.234.240.0/22}

^{198.41.128.0/17}

^{162.158.0.0/15}

^{104.16.0.0/13}

^{104.24.0.0/14}

^{172.64.0.0/13}

^{131.0.72.0/22}

15.157.55.169

13.239.34.44

Symptoms

If those IP ranges and addresses are not allowed, this can result in errors during the connection process, such as Error: "504" or Error: "Load Failed".