4SC Free – IP still blacklisted after 24+ hours and clean reinstall + backup restore

[nsiou98]

Hello,


I am using a self-hosted 3CX V20.0.995 SP9 system with a BASIC 4SC Free license.


I am currently unable to access the Admin Console because my public IP is reported as blacklisted.


The important point is that:

• More than 24 hours have already passed since the blacklist occurred.
• I have already performed a completely clean 3CX reinstall.
• I restored my existing backup after the reinstall.
• The same blacklist problem still exists.
• Fail2Ban is not installed on the server.
• I also checked the server firewall rules and cannot find a rule blocking my public IP.
• I have access to my 3CX Customer Portal account and can see the system/license there.
• I also cannot recover the System Owner password because the password-reset email is not being received.

I understand that Free/4SC users normally need to wait 24 hours for a blacklist to expire. However, in my case the issue persists after 24+ hours and even after a clean reinstall and backup restoration.


Could a 3CX staff member please advise whether this is a persistent/global blacklist, another security mechanism, or something that needs to be cleared by 3CX?


I would really appreciate assistance in restoring access to my system.


Thank you.

 

[KyriacosS_3CX]

You can visit https://www.3cx.com/contact/ , choose the Customer Service path and request help from there.

 

[SteveITS]

The 24h is for 3CX SMB accounts.

Ensure you’re not using a VPN, or other IP on the global blacklist. Try a different IP.

Free accounts need their own SMTP service configured not the 3CX service.