Setting up a Custom Domain for AS2
With AS2 Gateway, you can assign a custom domain name (hostname) to your AS2 receiver endpoint. For example, instead of sending to the default
endpoint, your partners will see - and send messages to - a custom URL (domain) such as
This is useful if you wish to use an AS2 domain name that better represents your organization, business or public domain, instead of the generic/default one provided by AS2 Gateway.
- AS2 protocol or AS2 Gateway does not use or depend on the message receive hostname/domain in their internal operation, except when using the test URL (this requires an additional step; see below). So, adding a custom hostname does not impact AS2 communication, or any already set-up AS2 connections.
- Adding a custom domain will not change the port number (HTTP: 8280) or the path (/service/as2-receiver) where AS2 Gateway accepts messages. If you also want to customize the port number, contact AS2 Gateway team.
Configuring a Custom Domain
Simply add a DNS “A” (alias) record, pointing your custom domain to the IP address of AS2 Gateway (
as2.your.custom.domain. 300 IN A 220.127.116.11
No changes are needed on AS2 Gateway or your account.
You can find the instructions to configure an A record, under the online documentation/guides of your DNS/hosting provider.
Instead of an A record, you can also add a CNAME record pointing your domain to
service.as2gateway.com. (note the trailing dot):
as2.your.custom.domain. 300 IN CNAME service.as2gateway.com.
Using Test URLs
If you or your partner is using (or planning to use) test-mode partner URLs (where the hostname must start with a test- prefix), you would also need to add an A/CNAME record for test-
- if adding an A/alias record: point to the same AS2 Gateway IP (18.104.22.168)
- if adding a CNAME record: point to
Custom Domains for HTTPS
By default, custom domain names are supported only for AS2 over HTTP. If you need a custom domain name assigned for HTTPS (e.g. instead of https://service.as2gateway.com:8443), please contact AS2 Gateway team, mentioning the domain name and the required port number (8443/4080/443).
AS2 protocol already encrypts transmitted data, so unlike in regular web traffic, HTTPS is not needed in most cases; unless there is a regulatory/policy requirement.