I have deleted all my Authority certificate,

Here are the general steps you can follow to obtain a tax clearance certificate:

1. Determine the Tax Authority: Identify the tax authority responsible for issuing tax clearance certificates in your state. In most cases, it will be the state's Department of Revenue or Taxation.
2. Gather Required Information: Before requesting the tax clearance certificate, make sure you have all the necessary information, such as your taxpayer identification number (Social Security Number or Employer Identification Number), tax filing history, and any outstanding tax obligations.
3. Contact the Tax Authority: Reach out to the tax authority either by visiting their office in person, calling their customer service helpline, or visiting their website. You may need to fill out a specific form or provide certain documentation to request the tax clearance certificate.
4. Submit Request and Pay Fees: Follow the instructions provided by the tax authority to submit your request for the tax clearance certificate. You may need to pay a processing fee or any outstanding taxes before the certificate is issued.
5. Wait for Processing: After submitting your request, the tax authority will review your tax records and financial history. The processing time may vary depending on the complexity of your tax situation and the workload of the tax authority.
6. Receive the Certificate: Once your request is approved, you will receive the tax clearance certificate. This certificate confirms that you have met your tax obligations and are clear to conduct certain business transactions or other activities that may require proof of tax compliance.

Just do a master reset to your phone. This could restore your device with default factory settings.

I have deleted nokia 5233 authority certificate

AUTHORITY CERTIFICATES

For Invalid certificate

I have not certificates to dowload operamini in my mobilephone 3110c.

go to that mobile shop from where you bought the mobile tell them that you missed your authority certificate they will provide you new one

Contact nokia repare service

Outlook express has a setting to check for certificate revocation.
Drop down the Tools menu and choose Options.
Click on the security tab and on the Advanced button.

You should see a section towards the bottom of the dialog box named Certificate Revocation.

I have never changed these settings and mine is set to Never.

If yours isn't set to never give it a try and see what happens.

Digital Certificates are used for encryption and authentication.

Revocation is used when a Certification Authority issues a certificate to a company or individual and then something happens that makes the Authority cancel the certificate. There are many reasons why and I'm not going to speculate.

Have a look in your case who issued the certificate and who it is issued to. It could be someone up to no good and you would be better off to figure out what is going on before you just turn it off.

is this he first time that you received that problem/error?
some sites have security/authorization/ certification before you can sign in..
***This error occurs when the client does not know about the certificate authority that issued the server certificate. The problem may be corrected by installing the certificate authority's root certificate. A list of all installed certificates can be viewed from Internet Explorer. From the View menu, click Internet Options, click the Content tab, and click Authorities.

>> for more info go to support.microsoft.com