Everytime i change any settings on Manage Jenkins > System Settings, Jabber plugin can't connect to my XMPP server because the password is wrong. I need to change the password to the correct value again everytime.

Maybe Jenkins is encrypting the password on save and jabber plugin is not decrypting when I open this page, and when I save the page it's encryting what is already encrypted.

But If Jabber plugin change to use jenkins credentials instead of old method (save password directly on plugin) the problem will resolved.