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My Samsung Galaxy S4 (GT-I9515) with Android 5.0.1 does not connect to one particular WiFi any more - the Eduroam network at my workplace. The network is listed in the available networks list, with sufficient signal strength (3, mostly 4 (out of 4) bars), and with the small text Saved, Secured below. When I tap it, the popup menu Connect / Modify / Forget appears as usual. When I tap Connect, the popup menu closes and everything remains as it is. The network still shows Saved, Secured. In other words, nothing at all happens.

This happens only on this device (other devices, running Android* and other OSes, with exactly the same connection settings**, work well in this wifi network) and only with that network (I never have any issues connecting to other wifis with that problematic S4). Also, it used to connect to that network until about a week ago. To my knowledge, nothing significant (system update etc.) was changed to either the network or my device at that point.

*) an S4 (GT-I9505) with Android 4.2.2/4.3/4.4.2/5.0.1 (gradually updated while trying), a Google Nexus 7 with Android 5.1.1

**) TTLS, PAP, up-to-date certificate

I have removed and re-added the network, and switched off and on wifi several times, as suggested in numerous online resources (among others, by this answer, or by this troubleshooting guide). Also, I have re-checked and re-added my password and my user name several times.

Without knowing what I have to be searching for, here are some lines from the logcat around the time of trying to establish a connection that might be related:

D/WifiMonitor( 883): didn't find BSSID Trying to associate with SSID 'eduroam'

E/WifiStateMachine( 883): ConnectModeState SSID state=re-enabled nid=4 [id=4 ssid="eduroam"]

E/WifiConfigStore( 883): SSID re-enabled for "eduroam"CCKM had autoJoinStatus=0 self added false ephemeral false

E/WifiStateMachine( 883): ConnectModeState SSID state=temp-disabled nid=4 [id=4 ssid="eduroam" auth_failures=2 duration=37]

E/WifiConfigStore( 883): SSID temp disabled for "eduroam"CCKM had autoJoinStatus=0 self added false ephemeral false

E/WifiConfigStore( 883): message=id=4 ssid="eduroam" auth_failures=2 duration=37

Unfortunately, I do not quite understand yet what they are saying, and whether they contain any information on the issue at all (other than the mere fact that the issue exists, as the connection failed to be established). It should be noted that many of the output messages seem to appear the same way in quite some PC Linux distributions, where quite a bit more options for debugging and reconfiguring the system are available than on an Android smartphone - therefore, the mentions of these messages I could find online in various forums were usually dead-ends for my particular case.

I cannot get any support by the organization running the wifi. The administrators say they have not heard of any such issues and solutions, and as they do not officially support Android devices, and everything works on their private devices, they will not actively search for a solution.

While I appreciate solutions, I understand that with the information provided it is hard, if not impossible, to solve the issue. Hence, my primary question is: How do I diagnose what is wrong? What do I have to look for in the logcat output? Are there any other places that I should look at?

There are some seemingly similar questions, which do not answer my question:

I can safely say that solutions such as connecting a laptop to wifi first to wake up the DHCP server do not help here, as this is about an office building with 100+ laptops constantly connected to wifi already.

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    I recently had issues with my local University's eduroam network as well and AFAIK they did some changes to the certificate. Other eduroam networks across Europe worked fine. The issue is gone for me though. And I certainly didn't fix anything on my device – stefan May 29 '15 at 14:44
  • @stefan: Indeed, it works again now - but I'm still interested in an answer to this question. How can I diagnose this kind of issues? – O. R. Mapper Jul 1 '15 at 14:10
  • that's interesting indeed. – stefan Jul 1 '15 at 14:11

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