To be exact this was TAC reply:   Those alarms are informational. These alarms alert users for buffers getting exhausted. Those alarms are related to the traffic the WLC is receiving. A high amount of traffic can overwhelm the WLC operation. As action plan I suggested you to enable TCP MSS. What we are doing with this feature is defining the segment length clients will send to wireless infrastructure. When a big amount of traffic is being sent to the WLC with high segment length retransmissions could occur thus WLC could get overwhelmed. With TCP MSS enabled (1250) what we did was reducing the segment length then we reduced retransmissions and an improvement in the network traffic management is expected. So you stopped seeing those messages. No issue has been identified in the WLC. No crashes, no core-dumps.   How to avoid those messages? We have two options (being the second one the best one for this scenario):        Enabling TCP MSS == 1250. (This is a feature we always recommend to enable globally with value 1250)      Modifying APs to work as flexConnect.   In this moment all your APs (589) are working as local and your WLANs are configured as central. That means all clients traffic will be sent to the WLC. With flexConnect-localSwitching enabled, clients traffic will remain in the LAN where the APs are connected. ... View more

Hi,   I have an update. After opening case with TAC, they suggested that we change our TCP MSS value to 1250 or use flexconnect with local switching even though we do not have any branch sites. After changing the TCP MSS to 1250 things are away better and I'm not seeing any of those syslog messages. Thanks. ... View more

Don't downgrade to 8.5.135. I 'm having the same issue on pair of 8510 in HA running 8.5.135.  For comparison: show memory mbuf summary System Up Time................................... 18 days 0 hrs 24 mins 44 secs Maximum number of Mbufs.......................... 24576 Number of Mbufs Free............................. 24560 Number of Mbufs In Use........................... 16 Top 10 Mbuf Usage: Fast Path Control................................ 40 IPv6............................................. 5 DOT1X............................................ 4 802.11 Mgmt...................................... 2 802.11 Probe..................................... 1 IAPP............................................. 1 CAPWAP........................................... 1 DHCP............................................. 1 CDP.............................................. 1 Orphan........................................... 1 (Cisco Controller) > show memory statistics System Memory Statistics: Total System Memory............: 16282812416 bytes (15.16 GB) Used System Memory.............: 5421293568 bytes (5.04 GB) Free System Memory.............: 10861518848 bytes (10.11 GB) Effective Free Memory..........: 10583502848 bytes (9.85 GB) Bytes allocated from RTOS......: 1947444480 bytes (1.81 GB) Chunks Free....................: 129 bytes Number of mmapped regions......: 31 Total space in mmapped regions.: 18446744071678341120 bytes (382.10 GB) Total allocated space..........: 1882917152 bytes (1.75 GB) Total non-inuse space..........: 64527328 bytes (61.54 MB) Top-most releasable space......: 77520 bytes (75.70 KB) Total allocated (incl mmap)....: 18446744073625785600 bytes (383.92 GB) Total used (incl mmap).........: 18446744073561258272 bytes (383.86 GB) ... View more

I'll take that back, after trying multiple times it's working now. ... View more

I'm having an issue too when trying to do an inline upgradeit saves the ADE-OS, then I'm getting: Initiating application upggrade ... Stage 1 of 7: transferring file... % local file not found ... View more

Thanks Lewis hummm My NLB is still not working, are you running windows 2003 or 2008 ? ... View more

Hi Lewis, Were you able to fix your issue, I'm in the same situation. ... View more