Not able to connect adb after upgrate Android Studio to 3.4

Question

unable to connect to adb.check the event log for a possible issue, verify that localhost entry is pointing to 127.0.0.1 or:: 1 for ipv4 or ipv6

Answer 1

I faced this issue last night, and I tried these methods to fix:

• download older platform-tools and place it in the android sdk folder.(not work for me)
• adb kill-server, adb start-server.(not work for me, adb had no response with these cmd)
• kill the process that occupies port 5037.(for me, there is no other .exe run at this port)
• reinstall platform-tools in Android Studio.(not work)
• download ADB Kits and replace them in platform-tools folder.(work!!!)

It seems that my adb file has been modified or replaced by some programs. You can try these methods, and I hope some of them can work for you.