# RV55 Unable to Access Ace Manager over APN **URL:** \ **Category:** AirLink routers\ **Created:** [August 25, 2022, 3:35pm UTC](https://forum.sierrawireless.com/t/rv55-unable-to-access-ace-manager-over-apn/27711 "2022-08-25T15:35:42Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![rmajewski](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@rmajewski](https://forum.sierrawireless.com/u/rmajewski)\ **Post date:** [August 25, 2022, 3:35pm UTC](https://forum.sierrawireless.com/t/rv55-unable-to-access-ace-manager-over-apn/27711/1 "2022-08-25T15:35:42Z")
I am trying to deploy new RV55’s over Verizon’s APN network. See the topology below. We are using IP bypass, using the WAN IP to connect to an RTU. I have configured port forwarding, remote access and bypass according to this doc: [Industrial Networking Solutions Tips and Tricks: Configure IP Passthrough on Sierra Wireless Modems (ALEOS 4.8.x and newer)](http://blog.industrialnetworking.com/2017/08/configure-ip-passthrough-on-sierra.html) In the lab, I am able to connect from a PC to the RTU over the APN/RV on ports with no issue except with https/http needed to access Ace Manager. I have verified/tested: - I can telnet over port 9443/9191 to the modems from the PC - We are not blocking any ports from the router to the APN. - I have tried multiple browsers, multiple PC’s and verified no security controls on our end are blocking https requests. - Tried multiple modems with different SIMS - I CAN access ACE Manager locally from the LAN port directly connected to my PC via the 192.168.13.31 address. In short, I can install the modems in the field and they will operate for what we need to do for comms, however I can no longer access ACE Manager via web to make changes. I have configured numerous RV55’s in the past with no issues accessing ACE Manager, but these deployments were not over an APN. Any assistance is appreciated. ![2022-08-25_10-23-52](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/b/b0c70cd014e447b3385010efcf146b496840a6a2.png) ---
**Author:** ![rmajewski](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@rmajewski](https://forum.sierrawireless.com/u/rmajewski)\ **Post date:** [August 31, 2022, 3:20pm UTC](https://forum.sierrawireless.com/t/rv55-unable-to-access-ace-manager-over-apn/27711/2 "2022-08-31T15:20:57Z")
Well, I got this resolved. For future reference if anyone has issues with this: the WAN/Cellular tab \> Cellular \> General \> Advanced: set the “Enable MSS Clamping” to “Manual”. I set to 1360