(adsbygoogle = window.adsbygoogle || []).push({}); Recently I updated to OFW 3.56 but I forgot to restore the original CA24. Now when I try to sign in PSN I get DNS error many times. I am still able to play online but, it is more difficult now because of the random DNS errors...
As you know there is no way (FTP, downgrade or other method) on 3.56 to replace the modded certificate with the original one.
Is there anything I can do now about this?

if u use proxy then it wont work change ur dns settings back to normal

that may happen with your modem restart it. i didnt restore the original certificate niether mine is running good

Error Codes I get:

    80028ED4

80710102

Just restore the ps3. But copy everything to a usb first

Shouldn't the system update replace the modded CA24.cer?
Must be your router..

when u upgraded from 3.55cfw to 3.56 it would of put the orginal one back same with reinstall any fw it will put the orginal one back so it ivert your ps3 settings or your router no set up right.

true because the certificates are on the flash and flash is were updates install

Both are related to a DNS problem. And some say the first code is related to hardware.

This is what you should try and should hopefully fix it.

First Power down your ps3. Shut your modem down, then your router. Unplug the router and modem from the power.
Connect the modem to it's power and let it start up.
Connect the router to it's power and let that start up too.
Your PC should have internet again, check that first.

If your pc is connected again, do this.
Click start - run and type CMD there. If you have win vista/7 click start and type cmd in the typebox and press enter.

You are now presented with a Command box.
Type:

    ipconfig /all

You should see a output like this:

            Verbindingsspec. DNS-achtervoegsel: private

        Beschrijving . . . . . . . . . . .:

          NVIDIA nForce 10/100/1000 Mbps Ethernet

        Fysiek adres. . . . . . . . . . . : 00-13-private

        DHCP ingeshakeld. . . . . . . . . : ja

        Autom. configuratie ingeschakeld. : ja

        IP-adres. . . . . . . . . . . . . : 192.168.0.104

        Subnetmasker. . . . . . . . . . . : 255.255.255.0

        Standaardgateway. . . . . . . . . : 192.168.0.1

        DHCP-server . . . . . . . . . . . : 192.168.0.1

        DNS-servers . . . . . . . . . . . : 192.168.0.1

Now turn on your PS3 and go to internet settings.
Select wired or wireless and enter the SSID and pass if you use wireless.

When you are on the setup page for your IP address select MANUAL.

You will get a page with the following:

    

IP Address 0.0.0.0

Subnet Mask 0.0.0.0

Default Router 0.0.0.0

Primary DNS 0.0.0.0

Secondary DNS 0.0.0.0

Use the things of the CMD box for your ps3 so it becomes:

    

IP Address [B][U]192.168.0.105[/U][/B]

Subnet Mask 255.255.255.0

Default Router 192.168.0.1

Primary DNS 192.168.0.1

Secondary DNS 0.0.0.0

Note the IP address, its 1 digit up. 104 on pc, 105 on ps3. Your ip might be 192.168.0.3 then make your ps3 192.168.0.4.

The Default Router on your ps3 is the Default Gateway in the CMD box on your PC.
As you can see i dont have a secondary DNS, but maybe you might have it, so enter that too if you want, but its not needed.

Use this for the next couple of pages:

    DHCP - Do Not Set

DNS Settings - Automatic

MTU - Automatic

Proxy Server - Do Not Use

UPnP - Enable

Now try again if it works and let me know.

Re-install 3.56 official firmware.