Bots are troublesome and malicious visitors to one’s website and are unwanted. To discourage such visitors, you can check for some of their behaviors. Their actions may cause your CPU and RAM used more, without any benefits to you.
- Referrer not defined.
- IP Address does not resolve to country, city information.
- IP Address does not resolve to proper network address.
- HTTP Agent name is awful.
- Their IP Address is already appears in black-listed database.
- Visitor comes back too frequently.
- Accesses invalid or non-existing contents.
- Does not have JavaScript enabled in the client side.
- Causes too many login failures. Probably logs in with admin, administrator, root, etc. as usernames, including other valid user names.
- Attempts to increase the page view only. For example, main page is loaded, but the associated css, javascripts and images are not loaded.
- Attempts to perform Denial of Service.
- Looks for specific file (url) within the website that you do not have.
- Brute-force login attempts.
- Uses multiple IP Addresses (Similar feature coming from a different network) around the globe.
- Sometimes originates from a corporate network.
- Tries to steal information, harvest email addresses.
- Looks for known vulnerabilities or known weak plugins
- Scans for software version or performs something you do not want.
- Visitor does not convert to a “customer”.
This causes the blockage in the arteries which concludes in improper supply of blood to the penis. viagra without prescription check out this But even if temporary, the inability to generic levitra without prescription get an erection can be elicited by at least 2 distinct mechanisms, which includes central psychogenic and reflexogenic. Smoking and drugs congests blood arteries, while drinking desensitizes penis, order cialis from india thus leading to erection woes in the bedroom. These touches give generic sildenafil viagra different feeling to the human being.
Not sure, with what intentions they come to one’s website.
Other details in Wikipedia article on Internet Bot.