Question : sql job with proxy agent failed to execute

when I try to execute job which has proxy use for command shell execution, it thrown me error below

Unable to start execution of step 1 (reason: Error authenticating proxy '%', system error: ConnGetProxyPassword).  The step failed.

Answer : sql job with proxy agent failed to execute

Couple of things:

1. If you have a long password for the account then try trimming it down.
2. If your job is calling a SSIS package where you have mentioned the user and password within the package. Then try to Deploy the package and use ServerStorage or use Filesystem and provide the password in the package configuration window.