I encountered a problem when remotely connecting to OPCServer

[lishuaia]

I encountered a problem when remotely connecting to OPCServer;
MatrikonOPC can connect remotely, but cannot connect using your library,serverlist report errors：server list EnumClassesOfCategories: Access is denied.Could you please help me answer this question? Thank you

The following image shows MatrikonOPC connected to a remote OPCServer

The following image shows the error message of the server list

[lishuaia]

The image of the code was not uploaded successfully. This is the running result image of the code

[huskar-t]

@lishuaia Is there a problem connecting to localhost to execute GetOPCServer？

[huskar-t]

@lishuaia Can you test using this version?
github.com/huskar-t/opcda v0.3.1-0.20240822113317-9cd33d1b0b09

[lishuaia]

localhost no problem, The remote connection is down发自我的 iPhone在 2024年8月22日，19:51，Xuefeng Tan ***@***.***> 写道： @lishuaia Can you test using this version? github.com/huskar-t/opcda v0.3.1-0.20240822113317-9cd33d1b0b09 —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>

[huskar-t]

localhost no problem, The remote connection is down发自我的 iPhone在 2024年8月22日，19:51，Xuefeng Tan @.> 写道： @lishuaia Can you test using this version? github.com/huskar-t/opcda v0.3.1-0.20240822113317-9cd33d1b0b09 —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: @.>

@lishuaia Is there still a problem with using this version, and are there any error messages?

[lishuaia]

@lishuaia Can you test using this version? github.com/huskar-t/opcda v0.3.1-0.20240822113317-9cd33d1b0b09

I couldn't find the code for this version? The tag on GitHub only has code for version v0.3.0

[huskar-t]

@lishuaia modify go.mod file

[lishuaia]

v0.3.1-0.20240822113317-9cd33d1b0b09

我测试了下，还是报错：Access is denied

[huskar-t]

@lishuaia
Could you confirm which line in the opcda library returns the error?

[lishuaia]

@huskar-t
The specific error is in the enum ClassesOfCategories method of IOPCServerList.go

[huskar-t]

@lishuaia It seems that you didn't replace the version I gave.
check your go.mod file and check if there is a method called getServersFromReg in opcserver.go

[lishuaia]

@huskar-t
This is the code I downloaded locally. There is a getServersFromReg method in opcserver. go

[huskar-t]

@lishuaia That's strange. In the GetOPCServers method, if the call to EnumClassesOfCategories fails, it will try to get it from the registry.Are you sure the error returned is caused by EnumClassesOfCategories?

[lishuaia]

@huskar-t
Yes, I added printing in the code. The following image shows the printed code and the running result

[huskar-t]

@huskar-t Yes, I added printing in the code. The following image shows the printed code and the running result

From the screenshot, the error occurs in getServersFromReg

[huskar-t]

@lishuaia 加我 qq 吧，有时间我帮你远程看一下

[lishuaia]

@huskar-t 加您了，我的QQ名称是迁就，麻烦通过下

[giter]

+1 for the same problem. I'm sure that the connection is successful when using opc-quick-client or konimarti/opc

[huskar-t]

@giter Can you try 0.3.3 and provide the call stack?

[giter]

@huskar-t get clsid: getClsIDFromReg: Access is denied.

`
host := "LACLIENT2"
progID := "ArchestrA.FSGateway.3"

    server, err := opcda.Connect(progID, host)
    if err != nil {
        panic(err)
    }
`

[huskar-t]

@giter Looks like there is a problem with the dcom configuration, please check the permissions and dcom configuration.
https://www.bilibili.com/video/BV1ZT4y1M75y

[giter]

I'm sure that the connection is successful when using opc-quick-client or konimarti/opc

[huskar-t]

@giter Describe your environment and setup

[huskar-t]

@giter What opc da server are you using?

[huskar-t]

@giter Try compiling the program into 32-bit.
GOARCH=386

[giter]

build example/browse with GOARCH=386 and run it remote , result:

[huskar-t]

@giter Can you try running in administrator account?