Xlib: PuTTY X11 proxy: wrong authentication protocol attempted
While setting up some developers with remote SmartSVN via X over SSH using Plink, I ran into the following error:
Xlib: PuTTY X11 proxy: wrong authentication protocol attempted
SmartSVN couldn't connect to the tunneled X server display. I was extremely confused since I'd been using X tunneling successfully with SecureCRT. After googling the error message a little bit, it seems that the part about the "wrong authentication protocol attempted" is misleading.