# OPC-UA via OpcCom Tunneler **URL:** \ **Category:** Ignition\ **Created:** [November 8, 2015, 8:26am UTC](https://forum.inductiveautomation.com/t/opc-ua-via-opccom-tunneler/10756 "2015-11-08T08:26:04Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![2Gi\_Technologie](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/2gi_technologie/32/3307_2.png) [@2Gi\_Technologie](https://forum.inductiveautomation.com/u/2Gi_Technologie)\ **Post date:** [November 8, 2015, 8:26am UTC](https://forum.inductiveautomation.com/t/opc-ua-via-opccom-tunneler/10756/1 "2015-11-08T08:26:04Z")
Hi, I have 2 gateway, i use OpcTunneller for OPC-DA remote access My Gateway A client OPC-UA : - Migrate to 7.8 rc3 - OPC-UA 3.8.0-rc3 My Gateway B server OPC-UA : - Ignition 7.7.4 - OPC-UA 2.7.4 - OpcCom 2.7.4 - OpcCom Tunneller 2.7.0 [color=#FF0000]not available in 7.8[/color] Since i upgraded the gateway A, there an error that comes but not immediatly. From Gateway A : ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/c/ccaacdd5aaa364416cbd37091ddc0e55089e2f75.jpg) From Gateway B : ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/8/87154ec5f6d186d0991fb3d09bd803f7104836a0.jpg) Thanks ---
**Author:** ![2Gi\_Technologie](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/2gi_technologie/32/3307_2.png) [@2Gi\_Technologie](https://forum.inductiveautomation.com/u/2Gi_Technologie)\ **Post date:** [November 8, 2015, 4:44pm UTC](https://forum.inductiveautomation.com/t/opc-ua-via-opccom-tunneler/10756/2 "2015-11-08T16:44:11Z")
Hi, I have delete and create connexion on Gateway A 7.8 and now it works but i have this messages (every second) on gateway B : I checked my user and password OPC\_UA user, it a problem of versions between two gateway ? ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/7/7b1d2366fd91878a767486312be587e3e6f6e937.jpg) ---
**Author:** ![2Gi\_Technologie](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/2gi_technologie/32/3307_2.png) [@2Gi\_Technologie](https://forum.inductiveautomation.com/u/2Gi_Technologie)\ **Post date:** [November 9, 2015, 8:36pm UTC](https://forum.inductiveautomation.com/t/opc-ua-via-opccom-tunneler/10756/3 "2015-11-09T20:36:37Z")
Hi, With the upgrade module OpcCom Tunneller in 7.8 I was able to upgrade my srvB to 7.8 Now i have two problems : 1 - I have i new OPC server automatically and i can’t delete it (FT-old) ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/0/0e149b2e8988ff1cb6c5a75c9953f4104fd01aaf.jpg) 2 - The same error in my preview post Thanks