I came across a very similar situation with tramp ssh, and I cannot figure out what your specific problem is, but only that you can get the full trace:
(setq tramp-verbose 10)
Then try connecting again and after it freezes, Cg and check for the presence of a buffer:
*debug tramp/plink USER@IP *
The verbosity of level 10 can be too overwhelming - you can experiment with lower levels (lower numbers) to see if it shows what might be the problem. Check docstring for tramp-verbose .
Good luck
source share