Once I moved to new flat that had no internet connection yet, so I went to restaurant located under my apartment, that had WiFi secured with password. I asked for it while waiting for the order - it was "A1B2C3D4". After a while I got anoyed that it was so slow, so checked if can acces router admin page and restrict access for their clients. It turned out I can and they used default login and password, so they ended up with only my MAC whitelisted. Seemed they had connected their own business PC ("office PC") via LAN too, so I was curious if they call ISP to check it out. I checked the router settings every day, even after I got my own internet connction and they had it blocked for about 3 weeks. Then they changed WiFi password, so I came again, asked for password (another shitty one), checked router admin page and... still default login and password...

People are clueless as shit hahaha

Laughing at non-techie people with contempt because you actually learnt it and they didn't need to. This alone might be okay occasionally when speaking to colleagues in private. But what you did here might have hurt the business! You should have been a white hat and told the owner about it or just leave it alone. Only because you can exploit something doesn't mean you should. Next thing they're gonna do is shutting down the WiFi for guests.

@Koolstr I hope one day a car mechanic breaks your air conditioning for the LULz. You will be so clueless haha

</sarcasm>

@Huuugo my point was not that "non-techie" didn't know what happened, of course they would not. My point is that you have your ISP support (should have mentioned it was ISP's custom router) that can fix that, which they eventually did I guess, but they did nothing about security anyways. ISP support should know that stuff too, right? And as I was not the one to get paid, I won't go there with "hey I hacked your router, change password", you know how it sounds to non-techie. I gave them signal by blocking WiFi in hope they call support, I even named my whitelisted MAC "change router admin password" and ISP support did nothing about security.

@Huuugo I did say PEOPLE are clueless, not exclusively non techies. We're all clueless in things not in our fields. Doesn't mean we can't laugh at others incompentency.

@blem14 What you did is in my opinion pretty immature. You used a company's WiFi further than the allowed use (WiFi during cosumation), for your own gain and even blocking all customers (whitelisting only your MAC).
WTF is wrong with you?!
And the best part: You say you were not telling because you were not getting paid, but you know, you enriched yourself with free internet access. I think that's enough as a payment.
People like you are the reason why non-tech people don't trust computer guys. You hurt a small business...

@qbasic16 if "free internet access" is payment in your opinion, then every restaurant, shopping mall, etc. "pays" me enough to maintain their security? Job they are paying real money to their ISP? I don't say it was mature or any good, everyone make mistakes (dude, it was few years ago, I was kid back then). I said that their security was bad, might cause more trouble than no internet for their customers and their ISP, that they eventually called, still did nothing about it. Anyways if turning off free wifi is something that "hurts small business", then this "small business" must have been terrible, as it's best perk is free wifi.

Free internet access is never actually free. In restaurants you are only allowed to use their internet connection if you buy/consume something there, which you obviously did not, when you used it after leaving. Other "free" WiFi hotspots may use your data for advertisements and they may have intermediate certificates so they can read even your SSL data packets.

I did not mean you actually got paid for support. What I meant was you enriched yourself by using the access outside of the allowed use which should be payment enough for you to at least tell the owner.
The ISP support probably did nothing about it because they were either incompetent or just didn't care, which is in no way a justification for your behavior. And yes in some way you hurt the business because people may have not come again because of the lack of WiFi access. I think you too would enjoy a restaurant/coffee more if you had free WiFi available...

@qbasic16 I will not argue with you about what I did, cause as I said, I'm not proud about it, just wanted to point out incopetence of people who fixed this. But to be precise, if there is no terms and conditions to hotspot usage, there is no real limit to use such. They did not specified rules, so I did not break any. That can be judged only on moral field, "and I don't give a damn 'bout my bad reputation".