ERR_SSL_VERSION_OR_CIPHER_MISMATCH

[Sk-73]

Dear all,

Does anyone encounter the below error before?

Impact level: Whole organization.

Web URL: https://alphabeta.com/

Troubleshooting steps:

Ping result: reachable.

Diff web browser: Microsoft Edge, IE.

I will need your guys kind advice on this matter.

Thank you in advance.

Sk

[#2 · Accepted solution]

Hi, These warnings look like webfiltering from windows defender for endpoint to me ? https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/web-content-filtering?view... Or an unapproved apps in MCAS (with mcas having a connection to defender for endpoints)

[#3]

@Rudy_Ooms_MVP 

Dear Rudy,

My colleagues carry out the following steps looks working as expected.
Please take note, once added the specific URL it will take some time to take the effect.

Allow specific websites
It's possible to override the blocked category in web content filtering to allow a single site by creating a custom indicator policy. The custom indicator policy will supersede the web content filtering policy when it's applied to the device group in question.

1. To define a custom indicator, follow these steps:
2. In the Microsoft 365 Defender portal (https://security.microsoft.com), go to Settings > Endpoints > Indicators > URL/Domain > Add Item.
3. Enter the domain of the site.
4. Set the policy action to Allow.