-
All replies
-
Helpful answers
-
Apr 18, 2016 1:14 PM in response to wb5hvhby Barry Hemphill,Random hardware issues are very difficult to troubleshoot (no surprise to you, I am sure). I would reset the SMC...cannot hurt, might help.
Barry
-
by Grant Bennet-Alder,Apr 18, 2016 1:25 PM in response to Barry Hemphill
Grant Bennet-Alder
Apr 18, 2016 1:25 PM
in response to Barry Hemphill
Level 9 (60,692 points)
DesktopsSMC reset is my recommendation as well.
Shutdown.
disconnect AC power cord. wait overnight --or if impatient:
... press the power on button for about ten seconds to discharge the power capacitors.
restore the AC power cord (there are some "always-on" power supplies inside, so it may spark at reconnect).
wait a quarter minute for all to settle.
Power on as usual.
-
Apr 18, 2016 2:00 PM in response to wb5hvhby wb5hvh,I am employing the impatient sparking maneuver now but will follow up with the patient zero-voltage 10-hour protocol several times. This is a spurious problem and so the results may not be readily apparent. This has been a UPS powered, always on computer for quite some time with uptimes often exceeding 1.6848e+16 nano seconds. I will report my findings when available but offer my thanks now.
73 de Jim
-
Apr 25, 2016 7:40 AM in response to wb5hvhby wb5hvh,I have tried SMC reset several times and the problem persists.
-
Apr 25, 2016 9:42 AM in response to wb5hvhby Grant Bennet-Alder,try:
System Preferences > Network > Ethernet > ( assist me ) > ( diagnostics )
-
Apr 26, 2016 5:18 AM in response to Grant Bennet-Alderby wb5hvh,Will check this and report next time it happens. There seems to be no consistency to the frequency of this issue.
-
Apr 26, 2016 2:10 PM in response to wb5hvhby lawandreann,Hi all.
I am having this exact same issue. There is another thread about it here :network port hangs
it seems to be triggered by heavy network traffic using the ethernet port(s). It just happened to me now while trying to backup GB's of data....I also have a 2008 mac pro with el capitan and when the issue arises, the ethernet port loses connection to the network and assigns itself a self-assigned ip address. I can change the ethernet cable to connect to the second ethernet port and then regain a connection to the network and continue until the problem eventually occurs on that port as well. The only way to fix the issue seems to be a reboot.
I am at a loss of what to do, it's frustrating that my server cannot reliably use its ethernet ports. I might simply take the hit on network speed and use the wireless network card instead.
For what it's worth the router that the mac pro is connected to is the latest airport extreme model at the time of this writing.
-
Apr 26, 2016 2:46 PM in response to lawandreannby lawandreann,This post on apple stack exchange seems related http://apple.stackexchange.com/questions/158931/why-does-my-wired-ethernet-conne ction-die-periodically-after-a-dhcp-leas…
Lower down in the post it describes the issue occurring more often when transferring large files to the server
-
Apr 26, 2016 8:12 PM in response to lawandreannby wb5hvh,My ethernet ports (both) go down at the same time. DHCP or static - makes no difference. There is no self-assigned IP. IP does not change but there is no ethernet activity. The only fix I've found is reboot. This happens regardless of router or switch - I've tried several.
-
Apr 26, 2016 8:13 PM in response to lawandreannby wb5hvh,Extensive ethernet activity does trigger the problem more often than not although sometimes manifests itself when there has been little or no activity.
-
Apr 27, 2016 8:07 AM in response to wb5hvhby lawandreann,Do you have both ethernet ports active ( both have a cable plugged in) perhaps that is why they both fail at the same time. I only use one port. I will double check the next time it happens if the address falls to a self-assigned. Currently my en0 has the problem but i changed the cable to en1 and I'm waiting for the issue to reproduce.
I agree it that it can manifest randomly even with little or no traffic, however this usually takes a few weeks for me. Increased traffic seems to increase the chances.
-
Apr 27, 2016 8:25 AM in response to lawandreannby wb5hvh,I do not but if one port stops I have tried to switch ports and it does not work. If one goes out, they both are out. It does not matter which port I start with.
-
May 11, 2016 7:29 AM in response to lawandreannby lawandreann,Well it happened on en1 now. The interface changed to a self assigned ip address. I tried the "assist me" and diagnose the ethernet ports, but it says that it seems to be working fine.
I tried changing the ethernet configuration to DHCP with manual ip address, but that did not seem to help and didn't result in a network connection.
I suppose I could sift through the system logs and try to find something.... painful.
I'm also gonna try with manual network settings and see if the problem arises after a reboot again.
-
May 11, 2016 8:24 AM in response to lawandreannby wb5hvh,On the last issue instance I tried the 'assist me' solution. There was some action too quick to follow and then saw a notice that the port was normal. This time it was; that is, it started working again. It has not failed since and life goes on with crossed fingers and abated breath. Will advise if it reoccurs but I have had some heavy use.