# Endpoint configuration in Ignition 8 **URL:** \ **Category:** Ignition\ **Tags:** ignition80\ **Created:** [September 27, 2019, 7:12pm UTC](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628 "2019-09-27T19:12:27Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![heybales](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/heybales/32/3358_2.png) [@heybales](https://forum.inductiveautomation.com/u/heybales)\ **Post date:** [September 27, 2019, 7:12pm UTC](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628/1 "2019-09-27T19:12:27Z")
I need help understanding proper configuration of OPC UA in ignition to enable 3rd party clients to connect. Our ignition gateway has multiple NICs, and I believe this requires configuration beyond the default. In 7.9, we had this configuration, and clients connected with no problem. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/8/8e01b74d794c364b9cc98ac2b69c9749f2d25135.png) In 8.0.3, this configuration (default) does not work. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/a/a3dc460d7913a0bc27df94b9653a657f9cd627e2.png) We modified the configuration to this: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/3/35b7d777a2d23354767929822886f547ffc3b03e.png) And now the clients can connect. This was a result of trial and error, and I’d like to know the valid options and resulting behavior for bind addresses and endpoint addresses. Documentation in the user manual has not been updated for these new configuration scenarios. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [September 27, 2019, 7:23pm UTC](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628/2 "2019-09-27T19:23:51Z")
The bind addresses settings tell the UA server which network interfaces to attempt to register on. `0.0.0.0` _effectively_ means "bind to _all_ network interfaces, which in combination with port 4096 means that technically anything that can reach your gateway (on _any_ of its network interfaces) would see your UA server on port 4096. There’s no reason you _can’t_ do that - it’s just that it comes with its own caveats. `localhost` is a special case identifier supported by (basically) everything, that just means ‘myself’. So binding to `localhost` means that only something else within the scope of whatever network interface is used for `localhost` (in Linux, there’s a special ‘loopback’ adapter, but I think it’s somewhat more obscured in Windows) will be valid - which basically just means that only something on your own machine can connect to that port to reach the UA server. `hostname` is a special wildcard that the UA server specifically supports - it just fills in whatever your machine reported as its own hostname. So in your UA client, you could probably put `opc.tcp://computer name` instead of `opc.tcp://10.XXX.XXX.XXX`, and it would connect. All that’s specific to the bind addresses setting. My understand of the ‘endpoint addresses’ is that it’s used to specify what your UA server will advertise/allow as acceptable addresses. So - if you’re binding to `0.0.0.0`, and any network card can _theoretically_ connect, but you only have `localhost` and `hostname` in your endpoint addresses, something trying to connect to you over a direct IP would _not_ work, because the endpoint they’re requesting wouldn’t match. Disclaimer: There are some deliberate simplifications here that someone _really_ pedantic might correct me on, but I’m confident in about 80% of that. Also, I’m far from a UA expert - this is all based on some assembled knowledge over time. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [September 27, 2019, 7:42pm UTC](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628/3 "2019-09-27T19:42:38Z")
The only thing I have to add to what Paul said is that `` and `` are just magic syntax to tell the server to try and find the hostname (when it’s literally “hostname”) or resolve the value to as many addresses or hostnames as possible when it’s anything else (“localhost” in this case). Any values you stick in there influence the endpoint URLs the server will return when a client calls the GetEndpoints service. Non default values can be necessary if you have more than one NIC and the first one Java sees isn’t the one you want, or if you’re doing something like putting your server behind a public IP that forwards to an internal IP, and you need to have that public IP available as one of the endpoint URLs. ---
**Author:** ![Carlos\_Villanueva\_He](https://avatars.discourse-cdn.com/v4/letter/c/7bcc69/32.png) [@Carlos\_Villanueva\_He](https://forum.inductiveautomation.com/u/Carlos_Villanueva_He)\ **Post date:** [June 14, 2022, 9:13pm UTC](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628/4 "2022-06-14T21:13:49Z")
Is the **Bind Address** 10.205.39.249 the same address as your Gateway? (10.205.39.249:8088) ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [June 14, 2022, 9:17pm UTC](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628/5 "2022-06-14T21:17:18Z")
Thanks for trying to be helpful, but this thread is 3 years old and doesn’t need to be resurrected for the purpose of further troubleshooting with the OP. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [June 14, 2022, 9:17pm UTC](https://forum.inductiveautomation.com/t/endpoint-configuration-in-ignition-8/28628/6 "2022-06-14T21:17:20Z")