Archive for December, 2010

Converting a PFX file to PEM and Key via openssl

December 9, 2010 11 comments

For some wierd reason, although the steps are simple, i cannot easily find a single page which gives you the exact steps (only 4) to convert a pfx file to a PEM and a KEY file

below are the steps to convert, it will generate an aa_s.key and a aa.pem which you can then use to put into your system e.g apache, hmailserver etc

REM Set the path to include the openssl directory

set path=%path%;C:\OpenSSL\bin;

REM Export the private key
openssl pkcs12 -in aa.pfx -out aa.key -nocerts -nodes

REM take out the encryption from the private key
openssl rsa -in aa.key -out aa_s.key

REM export the ssl cert (normal cases)
openssl pkcs12 -in aa.pfx -out aa.pem -nokeys -clcerts

REM export the ssl cert (Crescendo load balancers)

openssl pkcs12 -in aa.pfx -out aa_tmp_cn.pem -nodes
openssl x509 -in aa_tmp_cn.pem -out aa_cn.pem -text

REM Verification: run the following 2 commands, the output should be exactly the same
openssl x509 -noout -modulus -in aa.pem | openssl md5
openssl x509 -noout -modulus -in aa_cn.pem | openssl md5
openssl rsa -noout -modulus -in aa_s.key  | openssl md5


Categories: General

System.Runtime.InteropServices.COMException (0x800A03EC): Microsoft Office Excel cannot access the file

December 3, 2010 9 comments

You may encounter this error when trying to run excel automation via IIS.


There are several links pointing to this issue with the resolution found at by H Ogawa


I’m reproducing the same information here for ease of resolution

  1. Create directory “C:\Windows\SysWOW64\config\systemprofile\Desktop ” (for 64 bit Windows) or “C:\Windows\System32\config\systemprofile\Desktop ” (for 32 bit Windows)
  2. Set Full control permissions for directory Desktop (for example in Win7 & IIS 7 & DefaultAppPool set permissions for user
    “IIS AppPool\DefaultAppPool”)
Categories: ASP.NET