My python application is using M2Crypto to generate CSR in client, sends it to server and retrieves signed certificate in PEM format and saves as file.

Signed certificate file can be verified by M2Crypto. It can be read by OpenSSL successfully both in client and server.

However Windows clients report "This file is invalid for use as the following: security certificate" error when it is tried to be used. Like wise, in Ubuntu clients, "Could not display <filename>" is reported when it is tried to be viewed.

Platform Information for both client and server:

• Python 2.7.x
• M2Crypto 0.21.1
• OpenSSL 1.0.1e

Do you have any idea, what am I missing?

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