Hello Everyone,

I am experiencing a very strange problem in login system, When user was entering user and password he is getting below error

The parameter 'username' must not contain commas. Parameter name: username

But 2 days back he was able to login with same credential successfully but now he is unable to login we are sure that he is not using any comma's in the username, So is there any way we can stop 

Thanks,

Shabbir