Question

Webtools Agent - Ports

Web Client

Updated May 3, 2022

asked on April 27, 2022

Hi,

The ports (18435, 18436, 18437) for Webtools Agent, are these listing ports on the computer where Webtools Agent is running?

Does these ports needs to be opened on the web server where the Web Access is installed and configured?

I see the Webtools Agent is connecting to an external LF site for certificate validation, is Internet always needed for Webtools Agent to work?

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Answer

APPROVED ANSWER

replied on May 3, 2022

You can edit the hosts file to accomplish this. Edit c:\windows\system32\drivers\etc\hosts and add the following line:

127.0.0.1 plugin.laserfichelocalhost.com

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Replies

replied on April 27, 2022

Web Tools Agent runs on the end-user's machine, and the user's browser connects to it. Those ports don't have anything to do with the server hosting the web client site, so you don't have to do anything with them.

The certificate embedded in the agent has an expiration date, and it will need to download a new one before that time. With the connection blocked, the agent should work fine until the certificate expires, and then stop working, as the browser no longer completes its connection.

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replied on April 27, 2022

Thanks for the reply. I downloaded the certificate and saved it in the folder where it belongs. Still without internet connection, it doesn't work. When internet is working, it works fine.

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replied on May 2, 2022

@████████I am suspicious that certificate validation is failing on the machines without internet connections due to an inability to reach Certificate Revocation List URL endpoints.

One method to check: https://docs.microsoft.com/en-us/powershell/module/pki/test-certificate?view=windowsserver2019-ps

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replied on May 2, 2022

That is a possibility, though I think the CRL would be fetched from the CA that issued the certificate and it would be distinguishable from "an external LF site". Also, the only TLS cert the agent would need to validate would be when it connects to the web client server, which it would seem the browser was able to validate that certificate under the same network conditions.

I think the larger point is there are a few things it could be, and it will require some more data gathering to differentiate them.

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replied on May 3, 2022

Hi, I tried running the webtools agent on my VM where I have the WebClient server installed. No firewall or security. I tried it without internet connection, I am not able to connect the webtool agent without internet. Please see the attached.

I followed the following link to get and install the certificate. Without internet, how does the system validates the certificate? Am I missing a step? Do I need to validate the certificate separately and store something else for validation.

https://answers.laserfiche.com/questions/185937/LfWebOffice110-OfficePlugin-Could-not-find-a-valid-certificate#193712

WebToolsAgent without internet.png (63.14 KB)

| Download

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View 1 previous reply

replied on May 3, 2022

In the Laserfiche web client, Open the browser dev tools (F12) and check the network tab. You should see a request to https://plugin.laserfichelocalhost.com. This domain resolves to 127.0.0.1 (localhost), which could fail if there is no internet (because the DNS lookup would fail).

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replied on May 3, 2022

so, how does it resolve without internet? Can this tool work without internet?

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APPROVED ANSWER

replied on May 3, 2022

You can edit the hosts file to accomplish this. Edit c:\windows\system32\drivers\etc\hosts and add the following line:

127.0.0.1 plugin.laserfichelocalhost.com

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replied on May 3, 2022

Thank You Robert!

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Webtools Agent - Ports

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