Development of the free application Putty Connection Manager that can display more than one Putty sessions stopped in 2009, and it sometimes triggers this error when I double-click on any host in the right hand-side list:

PuTTY Connection Manager/An unexpected error occured : 

Object reference not set to an instance of an object..

When that happens, I have to reboot :-/

Does someone know of an alternative?

  • About this error, you just need to tick the options : "Show tray icon when minimized" and you won't see this error anymore. – William Remacle Apr 28 '11 at 7:52

SuperPuTTY works great and I've moved over to it. Also check out KiTTY, an 'improved' PuTTY:



  • Thanks for the tip. Apparently, unlike Putty Connection Manager, SuperPutty requires creating new items in its Putty Sessions list, but it's easy enough. – OverTheRainbow Mar 10 '11 at 23:43
  • Yes, you have to redo all your connections, but new ones appear immediately in the list. – Linker3000 Mar 10 '11 at 23:51
  • 2
    I guess SuperPutty is based on Putty Connection Manager, and suffers from the same issues (ALT-TABbing to it doesn't work very well, and CTRL-TAB doesn't work to move around open windows within SuperPutty). – OverTheRainbow May 2 '11 at 8:55
  • 1
    Superputty doesn't save username/pass or have login macros :( – Joe Coder Apr 20 '12 at 10:33
  • Just a few updates, SuperPutty (as of now incorporates fixes for some of the above issues. Note that I'm testing with KiTTY, but Alt-Tab now lets you resume typing in the PuTTY window, and Ctrl-Tab changes tabs left-to-right. As for username/pass, I've found a better solution is public/private keys with Pageant. Login macros are missing, although you can supply a script file to run in PuTTY via -m path/to/file. – brymck Jun 26 '13 at 6:40

Not the answer you're looking for? Browse other questions tagged or ask your own question.