"Connection was reset" after submitting some login forms in all browsers

Question

Recently I have a problem in all browsers (Firefox, Chrome, Internet Explorer) when I try to login in some websites, it seems posting comments in some other websites including this website also has problem:

In Firefox I receive: The connection was reset

In Internet Explorer: This page can’t be displayed

In Chrome: No data received ERR_EMPTY_RESPONSE

Certainly it occurs for specific websites and specific submits, otherwise I couldn't submit this question.

I don't know if it is caused by a malware or it is a problem with my ISP or internet connection!

I have NOD32 7 installed and my OS is Windows 8.1., I use no proxy.

I cleared cache and cookies of the websites with error in Firefox --> No effect

Disabled Antivirus --> No effect

Turned off Windows Firewall --> No effect

Tried to set the DNS of Wi-Fi manually to 8.8.8.8 --> No effect

Update: Today the problem was resolved. Then I guess, it was due to the ISP. specially that I am in Iran, and the past days we had the parliament elections!

Answer 1

It must be an internet connection problem from your computer, you can solve it by following the next steps:

1. Open the CMD with admin. privileges (if you use Win8, 8.1 or 10, press Win key + X >> Command Prompt (Admin).
2. Write the commands below, one by one and in order:
   • ipconfig /release
   • ipconfig /all
   • ipconfig /flushdns
   • ipconfig /renew
   • netsh int ip set dns
   • netsh winsock reset
3. As the last step, restart your computer (the "netsh winsock reset" command will tell you to restart your computer because it's necessary to finish the process).