Channel 22: open failed: connect failed: open failed

I got the below warnings when I execute repo sync -j16

frankhuang@test-Desktop:~/test$ repo sync -j16

/home/frankhuang/bin/repo

Fetching: 0% (0/63) warming upchannel 22: open failed: connect failed: open failed
channel 25: open failed: connect failed: open failed
channel 26: open failed: connect failed: open failed
channel 29: open failed: connect failed: open failed
channel 30: open failed: connect failed: open failed
channel 32: open failed: connect failed: open failed

this is one way can fix the above warnings if execute make -jx, the x must less or equal than 10

Is the a way to change some setting in configuration file?