Solve this problem

On the client side:

1 - Using Internet explorer 8

2 - Import and install, CA Certificate Chain

3 - Import and install, Certificate Revocation List

On the server side: After approve an application for registration certificate

Update Certificate Revocation List (CRL)

After doing this, I could import my certificates and sign word documents and pdf without problems.

He was using DogTag Certificate System 1.3, I have now installed the version 10.