After releasing PwnageTool 4.3 and Redsn0w 0.9.6RC9 for iOS 4.3.1 untethered jailbreak. Now the iPhone hacker Stefan Esser has cleared iOS 4.3.1 jailbreak issues. According to Stefan Esser, Redsn0w 0.9.6RC9 and PwnageTool 4.3 had been delayed due to the WiFi issues.
By the way, one of the reasons why the PwnageTool + RedSn0w tool was delayed was done to the mysterious WiFi issues. Turns out the issues also occur without a jailbreak.
Some users complain from WiFi issues that happened after jailbreaking their iOS device on iOS 4.3.1 usingRedsn0w 0.9.6RC9 and PwnageTool 4.3. If you are facing WiFi issues after jailbreaking your iPhone, iPod touch, iPad on iOS 4.3.1 using Redsn0w 0.9.6RC9 and PwnageTool 4.3 then simply reboot your WIFi router to fix this issue.