Issue Can't access the upgrade page of Plesk

[RickyDP]

Hi,

I'm trying to access the "upgrade" page of Plesk because I need to upgrade Plesk (I have Onyx 17.0.17) and I also need to upgrade PHP.
I tried to follow all the steps in those guides :
• How to manage ports for Plesk on Linux Server
• Which Ports Need To Be Opened for all Plesk Services to Work with a Firewall?
• The Updates and Upgrades page is blocked by a firewall
• Updates and Upgrades page cannot be opened: it just loads continuously or This site can’t be reached or ERR_CONNECTION_TIMED_OUT
• How to configure passive ports range for ProFTPd on a server behind a firewall?

but no one worked for me.
I tried to open all the port required to do this, and I think i did it since i see this on my shell:

# Generated by iptables-save v1.4.7 on Wed Mar 7 10:30:58 2018

*filter

:INPUT ACCEPT [2123:1129236]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [2004:1167944]

-A INPUT -p tcp -m tcp --dport 8443 -m state --state NEW -j ACCEPT

-A INPUT -p tcp -m tcp --dport 8447 -m state --state NEW -j ACCEPT

-A INPUT -p tcp -m tcp --dport 8447 -j ACCEPT

-A INPUT -p tcp -m tcp --dport 8443 -j ACCEPT

COMMIT

# Completed on Wed Mar 7 10:30:58 2018

but I still have a TIMEOUT problem.

When I try to load the upgrade page it simply doesn't work: blank page for 30 seconds then "ERR_TIMEOUT CONNECTION".

SInce I have this error I cannot upgrade Plesk nor PHP.

How can I solve?

Thank you so much!

 

[MarkM]

Who is the host? Have you checked there isn't an outside firewall blocking the port?

 

[RickyDP]

Who is the host? Have you checked there isn't an outside firewall blocking the port?

The host is Aruba (Italy). How can I check the outsider firewall?
Thank you so much