192.168.x.x:1500

So I have a small local server running a website. It’s not public facing at all, has a static IP address on my WiFi LAN and can be accessed by any Linux machine. I can’t see it on any iPhone or Android device though

I’ve looked up tutorials on line, ensured my firewalls allow local sharing on the WiFi, double checked I can even ping the server successfully with nmap on Android

Any tips?

::edit:: typo in post, not when searching for IP on LAN

  • hungover_pilot@lemmy.worldEnglish
    23·
    3 months ago

    Are you sure you are typing the address in correctly on android/ios? 198.162.x.x isnt part of private IP space.

  • Björn Tantau@swg-empire.deEnglish
    181·
    3 months ago

    Have you tried different browsers? You should also enter the full URL sometimes they’re a bit stupid nowadays. So http://192.168.x.x:1500/

    Maybe the browsers bring their own VPN. Some process all traffic to make it more “mobile friendly”. Or they have some other kind of proxy.

  • Finadil@lemmy.worldEnglish
    151·
    3 months ago

    Also check to make sure the mobile browsers aren’t set to HTTPS only, or at least have an exception for that ip. I’ve seen that before several times.

    • Prison Mike@links.hackliberty.orgEnglish
      61·
      3 months ago

      I’d curl from a machine on the same WiFi network as the phones just to confirm that HTTP is working. That way you’re not dependent on browsers that can be more finicky for debugging.

  • SergeantSushi@lemmy.worldEnglish
    131·
    3 months ago

    Some possibilities:

    1. WiFi has host isolation is enabled
    2. The network you’re connecting from is a guest wifi network
    3. You configured a firewall rule to isolate WiFi from LAN
    4. VLAN is enabled
      • SergeantSushi@lemmy.worldEnglish
        1·
        3 months ago

        I was assuming your server and Linux device were plugged in via Ethernet and your mobile devices were using WiFi. Now it sounds like your Linux system may be using the same access point.

        It could be something as simple as your browser trying to send the address to a search engine instead of directly looking for the site.

        When you’re trying to access it on mobile do you manually enter “http://” or “https://”? Those default to ports 80 and 443 respectively.

        If you’re using nonstandard ports you may need something like “http://192.168.1.42:8080” to use http on port 8080 or any other nonstandard port.

        Even if you are 100% sure your server is http or https try the other one to see if your error changes.

  • jet@hackertalks.comEnglish
    123·
    3 months ago

    Are your phones on the same network? Same vlan? Firewall rules? VPN?

    Does tcpdump on the server see the request?

    • jet@hackertalks.comEnglish
      92·
      3 months ago

      I get a lot of downvotes. I realize I say things that can be divisive. Why are people downvoting debugging steps? What’s divisive about that…

        • jet@hackertalks.comEnglish
          51·
          3 months ago

          I’m just trying to understand the rational. To me I downvote when the comment is against the community, or unproductive.

          If I’m being a net negative I should know why! Usually I have a guess as to why, but when I don’t, I reach out so I can understand better. I do want lemmy to be a better place, so feedback is useful.

          • catloaf@lemm.eeEnglish
            11·
            3 months ago

            When there’s only a few, it’s basically just statistical noise. Some people downvote anything. Some people just have fat fingers and missed the upvote button.

          • qjkxbmwvz@startrek.websiteEnglish
            2·
            3 months ago

            Some mobile clients make it easy to accidentally downvote. I sometimes see that I accidentally downvoted a comment from time to time.

          • shamrockpreacher5@reddthat.comOPEnglish
            2·
            3 months ago

            Your comments were good and kind. Debugging even obvious things is good since computer science is literal magic electrified rocks and keeping every step in our heads is impossible

            Yeah don’t worry about the downvotes

          • sunzu2@thebrainbin.org
            26·
            3 months ago

            If you say controversial shit outside of tech, mentally I’ll will follow you around downvoting.

            So you will see all of your post have a few downvotes.

            If it is just this one time, it is likely an anaomaly.

            Edit: BTW tcp dump is a nice trick, so you deff added to the discourse here IMHO

            Many people learn Linux and networking from these threads where idea are flying around. So deff don’t stop lol

    • RBG@discuss.tchncs.deEnglish
      3·
      3 months ago

      Yeah, if phones go via WiFi and the computer is on a cable the IP ranges may differ and that would explain you can access only via one of the two.

      • shamrockpreacher5@reddthat.comOPEnglish
        1·
        3 months ago

        Yeah everything (server, Linux clients, Android clients, other clients) is on the same WiFi network which is why this is extra frustrating since Linux just works like usual

  • Deckweiss@lemmy.worldEnglish
    81·
    3 months ago

    I had some similar symptoms on a Fritzbox router, because by default the devices connected over wifi were unable to communicate with those connected by cable. Some routers also had this setting for the different wifi bands, 2.4G & 5G.

    But I don’t think you’d be able to ping it if this were the case.

    Check yoyr router settings anyway, maybe you’ll find something there.

  • Possibly linux@lemmy.zipEnglish
    71·
    3 months ago

    My guess is that you are making a typo. Like others have said 192.162.x.x is a public IP. You probably want something like 192.168.x.x which probably is more like 192.168.1.1/24 with the last 1 being its own number

  • manuel2258@lemy.lolEnglish
    71·
    3 months ago

    Disable your mobile network and try again. I had the very similar issue where it would always fallback to the mobile network for local IPs although WiFi was connected and in the same subnet

  • zelifcam@lemmy.worldEnglish
    71·
    3 months ago

    Your network is probably configured with inconsistent subnets / netmasks. iOS / Android are on WiFi and getting a different subnet/netmask than your severs.

    Edit: What does pinging the server with nmap mean? Are you checking open ports or pinging the server? That doesn’t make sense or at least leaves us with more questions with the way you worded that. Although the nmap utility can provide both of those answers, I’m not sure that’s what you meant. Technically nmap and ping are two different tools.

    • shamrockpreacher5@reddthat.comOPEnglish
      11·
      3 months ago

      nmap -Pn 192.168.1.2

      At least it shows the server is up from the client’s perspective (other clients can actively see the same IP and server on port)

      Same WiFi subnet

      • zelifcam@lemmy.worldEnglish
        2·
        3 months ago

        Same netmask?

        When asking for network troubleshooting assistance, super useful to provide ANY kind of network info. So far we have WiFi and same subnet. Yet absolutely no details which are necessary to help form questions or provide answer.

        Can you post the IP Netmask and Gateway of your Linux server and one of your mobile devices that can’t view the server?

        Can you ssh into the Linux server from your mobile device?

          • zelifcam@lemmy.worldEnglish
            0·
            3 months ago

            Then there has to be a firewall, web server whitelist or some kind of configuration issue with the service being hosted. Because according to all your responses they are on the same WiFi with the same subnet/gateway/netmask.

  • Agility0971@lemmy.worldEnglish
    5·
    3 months ago
    1. network interface - check
    2. dns - not applicable
    3. firewall - check
    4. ping - check
    5. navigating to the web site - fail

    There are two causes here. Either server fucks it self over or the client fucks itself over. For server check logs, for client: check spelling, specify full protocol and try different browser to pinpoint the problem. It would be great to see the full ip address output from ‘ip -c a’ on both client and server.

    • shamrockpreacher5@reddthat.comOPEnglish
      3·
      3 months ago

      Thank you

      Any good debugging tools for android here or should I just rely on Linux networking tools through installed shells? Is there an industry standard for Android as a client?

  • atzanteol@sh.itjust.worksEnglish
    41·
    3 months ago

    Dunnon about iOS but some Android phones have a “network protection” config which uses a Google VPN, so it tends to block viewing the local network.

  • qjkxbmwvz@startrek.websiteEnglish
    3·
    3 months ago

    Any chance you have a DMZ set up on your router?

    On your router, are there any settings specific to any host (other than the server maybe)? For example, a static IP or a port forwarded rule.

    Do you have a VPN on the phones? Can you traceroute from your phone to the server and post that? (I like PingTools for Android.) You should have 1 hop (you -> server, nothing in between).

    Can you verify that you are on the same wifi including same wifi channel? Phone on 5GHz but Linux box on 2.4GHz, for example.

  • Shimitar@feddit.itEnglish
    2·
    3 months ago

    I have a very similar issue. Seems like Android will bypass your DNS resolver and thus cannot resolve your local names.

    I have my home services on “home.my domain.com” accessible from outside and re-mapped to “192.168.0.1” (my internal server IP) at home, and all PCs can access it while all android phones can only resolve to the public IP.

    I feel it’s something related to DoT or similar but haven’t yet dig in that.