PDF Stamper – Getting 502 Gateway Error by Tips and Tricks HQ Support Portal › Forums › WP PDF Stamper › WP PDF Stamper Troubleshooting › PDF Stamper – Getting 502 Gateway Error Tagged: pdf stamper, WPEngine This topic has 13 replies, 4 voices, and was last updated 10 years, 3 months ago by wzp. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In