# GX450 cannot NAT port to local PC

**URL:** <https://forum.sierrawireless.com/t/gx450-cannot-nat-port-to-local-pc/17267>\
**Category:** AirLink routers\
**Created:** [August 14, 2019, 8:28am UTC](https://forum.sierrawireless.com/t/gx450-cannot-nat-port-to-local-pc/17267 "2019-08-14T08:28:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![vhoang1102](https://avatars.discourse-cdn.com/v4/letter/v/b77776/32.png) [@vhoang1102](https://forum.sierrawireless.com/u/vhoang1102)\
**Post date:** [August 14, 2019, 8:28am UTC](https://forum.sierrawireless.com/t/gx450-cannot-nat-port-to-local-pc/17267/1 "2019-08-14T08:28:41Z")

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Hi all,

Could you please help me out. I’m going to configure GX450 as Nat device which uses 4G as WAN interface and Ethernet as Lan interface.

My configuration is:  
1. Reset GX450 to default factory.  
2. Plug-in SIM card and it connect to 4G. Here I can check ping to [google.com](http://google.com)  
3. Navigate to Security tab and enable Port Forwarding  
4. From Iphone, I access website that was hosted on PC but connection is refused.

Please can you tell me whether I missed any configuration?

Thanks,  
Hoang

 ![GX450_Diagram](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/a/a67b862689f6436d58aa2daeadfc6266e32a3de3.jpeg)

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**Author:** ![vhoang1102](https://avatars.discourse-cdn.com/v4/letter/v/b77776/32.png) [@vhoang1102](https://forum.sierrawireless.com/u/vhoang1102)\
**Post date:** [August 14, 2019, 8:29am UTC](https://forum.sierrawireless.com/t/gx450-cannot-nat-port-to-local-pc/17267/2 "2019-08-14T08:29:27Z")

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This is my Security configuration.

 ![1](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/5/536b7177702334ea533dff64872862abbaa6b7f2.png)

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**Author:** ![Donald](https://avatars.discourse-cdn.com/v4/letter/d/ac8455/32.png) [@Donald](https://forum.sierrawireless.com/u/Donald)\
**Post date:** [October 17, 2019, 4:40am UTC](https://forum.sierrawireless.com/t/gx450-cannot-nat-port-to-local-pc/17267/4 "2019-10-17T04:40:05Z")

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Hi vhoang1102,

Please make sure that your GX450 has public IP from your mobile service provider. You then can use ping.eu to check that IP is really work.

Thanks,