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Samsung Galaxy A5 2017: Authentication Error and Slow Internet Speed on UPC Wifi

blaux 8526 12
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  • #1 17256081
    blaux
    Level 8  
    Hello.
    The problem is:
    I have Tel Samsung Galaxy A5 2017. There was no problem with it until last week, when the phone does not want to connect to the home WIFI network. All other devices can easily connect, there is no limit on the number of connected devices. Previously, I could easily use this wifi on this phone. Usually, when trying to connect to this wifi, the message "authentication error" pops up even though the password is entered correctly. Once the miracle is able to connect, the connection breaks down, and the internet speed on this phone is 8 Mb / s, and on others 300 or 500 Mb / s.
    I have already tried to connect via the WPS button, it did nothing.
    I also tried to add my device to the MAC list and nothing changed. What's next? Only the service remains?
    Internet with UPC, connect box: p
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  • #2 17256163
    nutergsm
    VIP Meritorious for electroda.pl  
    Did you reset the router, did you check if it connects to another wi-fi network? Have you tried hard reset or upload new software? If nothing changes, give it back to the warranty right.
  • #3 17256224
    blaux
    Level 8  
    A router reset was done just like the phone's factory settings. The phone connects to any other wifi network, but not the specific home one.
  • #4 17256230
    nutergsm
    VIP Meritorious for electroda.pl  
    So there is a problem with your wi-fi network. Have you changed the password encryption settings? on what frequency is your wi-fi network transmitting?
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  • #5 17256278
    VooVoo
    Level 34  
    I assume that the phone's mac is not on the router's blacklist? From the phone make forget this network and try to connect again.
  • #6 17256485
    E8600
    Level 41  
    It looks like invalid DNS.
  • #7 17256610
    blaux
    Level 8  
    The phone's Mac is not blacklisted.
    I haven't changed the password encryption, where to check the frequency? Forget the network I've already done 100 times ;)
    And these DNS's? How to check, change?
  • #8 17256663
    nutergsm
    VIP Meritorious for electroda.pl  
    In the router settings in the tab should be.
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  • #9 17256793
    blaux
    Level 8  
    "2.4 GHz and 5 GHz wireless networks are on" is that it?
  • #10 17256881
    E8600
    Level 41  
    It's not about something like the movie.
    Possibly something is mixed up with the "UDP Protocol". Some operators specifically block this to offload the link.



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  • #11 17256909
    blaux
    Level 8  
    I do not know if it matters, but there were several devices connected to the router, today I connected two more and there was no problem .. Only in this Samsung I do not want to move .. :evil:
  • #12 17256945
    E8600
    Level 41  
    When you added a new network to your phone, did you set the encryption correctly?
    (WPA-PSK, WPA2-PSK is to be the same as you have set in the router)
  • #13 17256965
    blaux
    Level 8  
    Yes, WPA2 PSK is set on both.
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Topic summary

✨ The discussion revolves around a Samsung Galaxy A5 2017 experiencing connectivity issues with a UPC Wi-Fi network, specifically encountering "authentication error" messages despite correct password entry. The user reports that the phone connects to other Wi-Fi networks without issue and has already performed a router reset and factory reset on the phone. Suggestions from other users include checking the router's password encryption settings, ensuring the phone's MAC address is not blacklisted, and verifying DNS settings. The user confirms that WPA2 PSK is set correctly on both the phone and router. Further troubleshooting involves checking the frequency settings of the Wi-Fi network and potential issues with the UDP protocol.

FAQ

TL;DR: On this A5, speed dropped to 8 Mb/s while others reached 300–500 Mb/s, and it shows "authentication error". Fix by matching WPA2‑PSK, forgetting/rejoining, trying 5 GHz, and testing DNS. This FAQ guides Samsung/UPC users. [Elektroda, blaux, post #17256081]

Why it matters: It helps you quickly resolve home Wi‑Fi login and speed issues without a service visit.

Quick Facts

  • Device capability: Galaxy A5 (2017) supports dual‑band Wi‑Fi 802.11 a/b/g/n/ac for 2.4/5 GHz operation. [Samsung Galaxy A5 (2017) - Full phone specifications]
  • Router bands: The UPC Connect Box in this case broadcast both 2.4 GHz and 5 GHz networks. [Elektroda, blaux, post #17256793]
  • Security mode: Phone and router must use the same WPA2‑PSK setting to connect. [Elektroda, nutergsm, post #17256945]
  • Symptom snapshot: Phone showed "authentication error" and only ~8 Mb/s, while others on the same Wi‑Fi hit 300–500 Mb/s. [Elektroda, blaux, post #17256081]
  • Tried already: Router reset and factory reset done; the phone connects fine to other Wi‑Fi networks. [Elektroda, blaux, post #17256224]

How do I fix "authentication error" on my Galaxy A5 2017 with a UPC Connect Box?

Do a clean rejoin. 1. On the A5, open Wi‑Fi, tap your home network, then Forget. 2. Toggle Airplane mode on for 10 seconds, then off. 3. Reconnect and enter the correct WPA2‑PSK password. This clears bad credentials and refreshes negotiation. [Elektroda, VooVoo, post #17256278]

Where do I check my Wi‑Fi frequency (2.4 GHz vs 5 GHz) on the Connect Box?

Open the router’s admin panel and go to Wireless settings. You’ll see separate controls for 2.4 GHz and 5 GHz. In this case both bands were enabled. Prefer 5 GHz near the router for higher throughput. [Elektroda, blaux, post #17256793]

What security mode should I use, and does it need to match on the phone?

Use WPA2‑PSK (Personal). The phone’s saved network must match the router’s mode and key. As advised, “WPA-PSK, WPA2-PSK is to be the same as you have set in the router.” Mismatches trigger authentication errors. [Elektroda, nutergsm, post #17256945]

Could invalid DNS cause the connection or speed issues here?

Yes. Misconfigured DNS can cause slow page loads, app timeouts, or failed handshakes. “It looks like invalid DNS.” Test by temporarily setting manual DNS on the phone or router, then retry. If performance improves, keep the new DNS settings. [Elektroda, E8600, post #17256485]

My Galaxy A5 connects to other Wi‑Fi but not my home UPC—what does that indicate?

That points to a router or configuration issue, not a phone hardware fault. Focus on the Connect Box: verify security mode, band, DHCP range, and MAC filtering. Adjust settings and retest. [Elektroda, blaux, post #17256224]

How can I check if MAC filtering is blocking my Galaxy A5?

Log into the router and open Access Control, MAC Filtering, or Blacklist. Ensure your phone’s MAC address isn’t blocked or restricted. Remove it from any deny list, save, and reconnect. [Elektroda, VooVoo, post #17256278]

Why is my A5 only getting 8 Mb/s while others hit 300–500 Mb/s on the same UPC Wi‑Fi?

That gap suggests the phone is on 2.4 GHz or a legacy rate. Ensure 5 GHz is enabled and join that SSID. Avoid guest networks, and reboot phone and router. Update firmware on both, then retest. In this thread, others reached 300–500 Mb/s while the A5 saw ~8 Mb/s. [Elektroda, blaux, post #17256081]

Does WPS help here, or should I avoid it?

Avoid WPS. It is insecure due to known brute‑force flaws and can be unreliable. Disable WPS on the router and connect using WPA2‑PSK with the regular password for better security and stability. [Wi‑Fi Protected Setup (WPS) Vulnerable to Brute-Force Attack]

Where do I find and change DNS on the UPC Connect Box?

Open the router’s admin interface and look under Internet, WAN, or DHCP for DNS settings. If you don’t see them, contact UPC support, or test by setting manual DNS on your phone’s Wi‑Fi connection. [Elektroda, nutergsm, post #17256663]

Could my ISP or router be blocking UDP and breaking apps?

It’s an edge case, but possible. ISP or router‑side UDP restrictions can cause timeouts or very slow performance in apps. If other fixes fail, ask UPC to verify no filtering is applied, or test with another router. [Elektroda, E8600, post #17256881]

What router settings improve phone compatibility and speed?

Use WPA2‑Personal (AES), enable 5 GHz, and set modern channel widths. Avoid WEP and TKIP. These settings improve compatibility and throughput for phones and reduce interference problems. [Recommended settings for Wi‑Fi routers and access points]

How can I force my Galaxy A5 onto 5 GHz to avoid 2.4 GHz congestion?

Temporarily disable 2.4 GHz on the router or give 2.4 and 5 GHz unique SSIDs. Connect the A5 to the 5 GHz SSID, then restore normal settings. This isolates band‑specific issues fast. [Elektroda, nutergsm, post #17256230]

Should I reset software or use warranty if nothing works?

Yes. Try a hard reset or install fresh software on the phone after router checks. If the behavior doesn’t change, use the device warranty or service support. This sequence prevents needless hardware swaps. [Elektroda, nutergsm, post #17256163]

How do I reset network settings on a Samsung Galaxy A5 safely?

On the phone, go to Settings > General management > Reset > Reset network settings. Confirm to clear Wi‑Fi, mobile, and Bluetooth network data. Rejoin your Wi‑Fi afterward. [Reset network settings on your Galaxy phone]
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