It is all going to depend on the log entries, I can not give a blanket statement, nor list every single possibility. :)

I've pmed you the Last 70 lines of a2s.in.access.log a2s.in.error.log

--------------- Added [DATE]1420651084[/DATE] at [TIME]1420651084[/TIME] ---------------

I've a paid SSL Certificate , and me too I pay yearly for a Comodo SSL certificate.

--------------- Added [DATE]1420657916[/DATE] at [TIME]1420657916[/TIME] ---------------

have you got my pms , because I've been waiting for you reply the whole day :(

--------------- Added [DATE]1420665572[/DATE] at [TIME]1420665572[/TIME] ---------------

@ozzy47 seems to be busy , anyone else can help me here ? I can pm you my server logs if that will help

Umm,
First off, it has not been the whole day. It has been 6 hours since you PM'd me.

Secondly, I did not ask you to send me a PM, you should post the logs in the thread so all users can help.

Third, I have a full time job and help people out here in my spare time, I do not get paid to provide support, nor did you pay for support.

Fourth, when you are asking for free help, a little patience is needed, as this site is ran by volunteers, that do this in their spare time.

Now with that out of the way, I am going out for a bit, and I can take a look at the logs when I get a chance. :)

You can PM me the logs if you want, I'd be interested in looking at them.

Looking over what you PM'd me, I see no attempts of PayPay in the access logs, or error logs.

I would ask your host what the issue is, as PayPal can find your site under HTTP, but not HTTPS

sorry for bothering you , I've just seen that you're online at the time that I was waiting for you , you could simply tell me that you're busy and I can pm the logs for someone else , since I can't post the logs publicly due to security , I may get DDoss attacks easily since the website IP is shown in the logs

Not a problem. I looked them over and said this in another post.

if that's the case , why members can buy points using paypal and get the points !?

Yeah I forgot about that. Perhaps ask PayPal,tell them when your site is under HTTP, it connects to the script, payment_gateway.php with no problems, but when you use HTTPS, it does not. As I see nothing in the logs that PayPal reached the server.

Keep in mind that if you see a member online they actually might NOT be online. vBulletin has a built in time delay for showing the users in the WGO area. The delay is 15 minutes so just because you see someone online they may not actually be there they might have been there 10 minutes ago.