Exchange account in Mail.app Goes offline Frequently

[MontyC]

Hi

Running 10.11.4 on MacBook Pro (same issue with current non-beta release of El Capitan on recent Macbook Air).. issue with Exchange account (Exchange server is 2010 SP1) started with El Capitan. I have several accounts configured in Mail (iCloud, Exchange and a couple of IMAP accounts). The issue I am experiencing is only with the Exchange account... it keeps going offline about once every minute. The message I get is:

"Online Status
This account (name of account) appears to be offline due to a network problem. Do you want to try to go online now?"

When I choose take account online, it connects.

I have tried to change settings in Mail for account (unchecked auto discover, SSL etc) but same problem. I also removed and put back the account.. same problem. As I said, I did not have this issue before El Capitan. I can not find threads on this and I can not work out why. I considered using Outlook 2016 instead but the Exchange server is below minimum requirements of SP2. Any ideas?


EtreCheck version: 2.9.9 (260)

Report generated 2016-03-08 19:47:50

Download EtreCheck from https://etrecheck.com

Runtime 2:03

Performance: Excellent



Click the [Support] links for help with non-Apple products.

Click the [Details] links for more information about that line.



Problem: Other problem



Hardware Information: ⓘ

MacBook Pro (15-inch, Late 2008)

[Technical Specifications] - [User Guide] - [Warranty & Service]

MacBook Pro - model: MacBookPro5,1

1 2.4 GHz Intel Core 2 Duo CPU: 2-core

4 GB RAM Upgradeable - [Instructions]

BANK 0/DIMM0

2 GB DDR3 1067 MHz ok

BANK 0/DIMM1

2 GB DDR3 1067 MHz ok

Bluetooth: Old - Handoff/Airdrop2 not supported

Wireless: en1: 802.11 a/b/g/n

Battery: Health = Check Battery - Cycle count = 198


Video Information: ⓘ

NVIDIA GeForce 9400M - VRAM: 256 MB

Color LCD 1440 x 900

NVIDIA GeForce 9600M GT - VRAM: 256 MB


System Software: ⓘ

OS X El Capitan 10.11.4 (15E61b) - Time since boot: about 2 hours


Disk Information: ⓘ

SanDisk Ultra II 480GB disk0 : (480.1 GB) (Solid State - TRIM: Yes)

EFI (disk0s1) <not mounted> : 210 MB

Macintosh HD (disk0s2) / : 479.11 GB (172.85 GB free)

Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB


MATSHITADVD-R UJ-868 ()


USB Information: ⓘ

Apple Inc. Built-in iSight

Apple, Inc. Apple Internal Keyboard / Trackpad

Apple Computer, Inc. IR Receiver

Apple Inc. BRCM2046 Hub

Apple Inc. Bluetooth USB Host Controller


Gatekeeper: ⓘ

Mac App Store and identified developers


Kernel Extensions: ⓘ

/Library/Application Support/Fortinet/FortiClient/nke

[not loaded] com.fortinet.fct.kext.avkern (1.0.1 - SDK 10.8 - 2016-01-06) [Support]

[not loaded] com.fortinet.fct.kext.fctapnke (1 - SDK 10.8 - 2016-01-06) [Support]

[not loaded] com.fortinet.fct.kext.fctwfnke (1.0 - SDK 10.8 - 2016-01-06) [Support]

[not loaded] com.fortinet.kext.fctrouternke (1 - SDK 10.8 - 2016-01-06) [Support]



System Launch Agents: ⓘ

[failed] com.apple.softwareupdate_notify_agent.plist

[not loaded] 6 Apple tasks

[loaded] 148 Apple tasks

[running] 82 Apple tasks


System Launch Daemons: ⓘ

[not loaded] 46 Apple tasks

[loaded] 155 Apple tasks

[running] 87 Apple tasks


Launch Agents: ⓘ

[running] com.bjango.istatmenusagent.plist (2015-10-26) [Support]

[running] com.bjango.istatmenusnotifications.plist (2015-10-26) [Support]

[running] com.bjango.istatmenusstatus.plist (2015-10-26) [Support]

[loaded] com.fortinet.forticlient.fssoagent_launchagent.plist (2015-10-10) [Support]

[loaded] org.glimmerblocker.installer.plist (2016-01-28) [Support]


Launch Daemons: ⓘ

[running] com.bjango.istatmenusdaemon.plist (2015-10-26) [Support]

[running] com.bombich.ccchelper.plist (2015-10-29) [Support]

[loaded] com.fortinet.forticlient.appfw.plist (2015-10-10) [Support]

[loaded] com.fortinet.forticlient.epctrl.plist (2015-10-10) [Support]

[loaded] com.fortinet.forticlient.fmon.plist (2015-10-10) [Support]

[loaded] com.fortinet.forticlient.fssoagent_launchdaemon.plist (2015-10-10) [Support]

[loaded] com.fortinet.forticlient.servctl.plist (2015-10-10) [Support]

[loaded] com.fortinet.forticlient.vpn.plist (2015-10-10) [Support]

[loaded] com.fortinet.forticlient.wf.plist (2015-10-10) [Support]

[loaded] com.microsoft.autoupdate.helpertool.plist (2016-01-13) [Support]

[loaded] com.microsoft.office.licensing.helper.plist (2015-10-05) [Support]

[loaded] com.microsoft.office.licensingV2.helper.plist (2015-10-08) [Support]

[running] org.glimmerblocker.proxy.plist (2016-01-28) [Support]


User Launch Agents: ⓘ

[loaded] com.citrixonline.GoToMeeting.G2MUpdate.plist (2016-03-04) [Support]


User Login Items: ⓘ

PopClip Application (/Applications/PopClip.app)

CCC User Agent Application (/Applications/Carbon Copy Cloner.app/Contents/Library/LoginItems/CCC User Agent.app)


Other Apps: ⓘ

[running] com.bombich.cccuseragent.113632

[running] com.microsoft.Office365Service.150752

[running] com.microsoft.OneDrive-mac.55392

[loaded] com.microsoft.OneDriveLauncher

[running] com.pilotmoon.popclip.66592

[loaded] 396 Apple tasks

[running] 217 Apple tasks


Internet Plug-ins: ⓘ

SharePointBrowserPlugin: 14.6.1 - SDK 10.6 (2016-02-24) [Support]

Silverlight: 5.1.41212.0 - SDK 10.6 (2016-02-10) [Support]

QuickTime Plugin: 7.7.3 (2016-03-08)

Default Browser: 601 - SDK 10.11 (2016-03-08)



User internet Plug-ins: ⓘ

CitrixOnlineWebDeploymentPlugin: 1.0.105 (2013-04-26) [Support]

WebEx64: 1.0 - SDK 10.10 (2016-01-06) [Support]



Safari Extensions: ⓘ

StartPage HTTPS (2015-10-30)


3rd Party Preference Panes: ⓘ

GlimmerBlocker (2016-01-28) [Support]


Time Machine: ⓘ

Skip System Files: NO

Mobile backups: OFF

Auto backup: NO - Auto backup turned off

Volumes being backed up:

Destinations:

Time Office [Local]

Total size: 999.17 GB

Total number of backups: 9

Oldest backup: 02/11/2015, 08:52

Last backup: 06/01/2016, 16:03

Size of backup disk: Excellent

Backup size 999.17 GB > (Disk size 0 B X 3)



Data [Network]

Total size: 3.00 TB

Total number of backups: 18

Oldest backup: 31/10/2015, 13:21

Last backup: 29/12/2015, 20:07

Size of backup disk: Excellent

Backup size 3.00 TB > (Disk size 0 B X 3)


Top Processes by CPU: ⓘ

51% sandboxd

24% Mail

14% pkd(2)

9% kernel_task

6% WindowServer


Top Processes by Memory: ⓘ

618 MB com.apple.WebKit.WebContent(9)

578 MB kernel_task

438 MB mdworker(32)

139 MB mds_stores

98 MB mdworker32(4)


Virtual Memory Information: ⓘ

78 MB Free RAM

4.17 GB Used RAM (957 MB Cached)

0 B Swap Used


Diagnostics Information: ⓘ

Mar 8, 2016, 05:32:14 PM Self test - passed

 

[campyguy]

I don't have a definitive answer as to why this is a "new" issue with your client/server combination. I do know from experience that the error messages are by no means new - I owned and used 2010SP1 on my company's server while using Snow Leopard.

The issue/conflict was an MS bug that was addressed/fixed in SP2 - after SP2 was installed on my Server those issues/error messages disappeared forever. Hey, I bookmark this stuff...
https://support.microsoft.com/en-us/kb/2494798

Our temporary fix was to remove the offending accounts, then add them again - but the timeouts always reappeared. Installing SP3 or SP2 was the only fix that stuck. The only other temporary fixes that I'm aware of are turning off Autodiscover or checking your SSL credentials - another application could be using/blocking the relevant ports. Good luck...

 

[MontyC]

Thanks for the reply. I installed Little Snitch and blocked everything other than Mail and the problem did not go away. I also started in Safe Mode.. ditto. Defeated, I switched to Outlook 2011 which is less than ideal but at least it is stable (until the database crashes!).

If anyone has other suggestions, please jump in.