This is a difficult section as much of it is part of Shiva Puri National Park (you are traversing Nagarjan Mountain and the summit is called Jamicho). As such, the army has a base and controls the access points and is paranoid about hikers getting lost etc? It is a good climb up to where the army base sits if you are trying to do the circuit clockwise. We can offer no good advice here other than doing it as a day hike and entering and exiting from the main check point. If doing the circuit, your goal is to get into the park through the door that the army monitors. They may let you in, they may not. The main entrance is on the other complete side of the mountain. Once you get through the door, you go to your left and follow the very overgrown road. This is not a normal route as most lost trekkers here would be looking for the summit – on scouting trips we had to convince soldiers that I knew the trail well and would be fine. There is also a faint path along the wall before the door and one could follow this and then scramble up later and connect with the old road. If you get through, there is a lovely gentle road that contours around the backside of the mountain to Mudkhu.
It is very overgrown and near the end joins with a dirt road and finally a police check point at Mudkhu. These police will not likely care about whether you have a park entrance pass or not. Well done!