tramp-mode popping up while editing c/c++ files

Question

recently, some strange behaviour popped up when editing c/c++ files in emacs: Whenever I want to write a comment, the first / I enter will open a buffer of type *tramp/spc C* with error message

ssh: could not resolve hostname c: Name or service not known

My research has brought me as far as finding out that this is related to tramp-mode, something I never used or even knew that it exists. So, my question is: How can I get rid of this behaviour?

Using emacs24, installed from the Ubuntu 16.04 repos, if that matters.

Thanks for any advice.

EDIT 16/12/16

this most have something to do with my .emacs as the buffer is not popping up when starting with emacs -q.

Active modes in my editing buffer are

Abbrev Auto-Complete Auto-Composition Auto-Compression Auto-Encryption Blink-Cursor Electric-Indent File-Name-Shadow Font-Lock Global-Auto-Complete Global-Font-Lock Line-Number Menu-Bar Mouse-Wheel Tool-Bar Tooltip Transient-Mark

Answer 1

See this: https://stackoverflow.com/questions/778716/how-can-i-make-emacs-start-up-faster for similar problem(s), you need to solve for hostname, by editing /etc/hostname, and /etc/hostsfile. (see the answer of tsar2512).

Another solution (worked for me, on my mac): edit ~/.ssh/config file, replace everything you find out there with the following:

Host *
ControlPath ~/.ssh/master-%r@%h:%p
ControlMaster auto