12/31/2023 0 Comments Ephemeral port![]() In an environment running Distribute vSwitches, the vCSA binding to the dvSwitch virtual port can behave weirdly with the result of losing the connection with the virtual machine. The procedure to restore a failed vCSA connected to Distributed vSwitch (dvSwitch) could be tricky if the infrastructure uses dvSwitches with no ephemeral port group available. StarWind Virtual Tape Library (VTL) OEM.StarWind Virtual Tape Library Appliance (VTLA).StarWind HyperConverged Appliance (HCA).StarWind RDMA Performance Benchmark (rPerf).This caused a massive 70% drop in connections to Exchange servers - and clients as well as servers seem to behave much nicer now. User Configuration/Administrative Templates/Microsoft Outlook 2016/Account Settings/Exchange/Cached Exchange Mode/Download shared non-mail folders We changed the GPO-setting below to disabled for all users: This caused excessive connections to many mailboxes - and of course throttling and disconnects on the servers. So effectively Outlook clients were randomly accessing and synchronizing up to 50+ other calendars, without the users knowing. ![]() And it turns out that they were using the default setting for "Download Shared Folders".Īs far as I can tell, this setting relates to all the shared calendars that you have added in Outlook over time. Most of our clients are running Outlook 2016 in cached mode. So I think that I owe an update:Īfter switching to Mapi/http our port exhaustion issue stopped.īut we saw very high CPU usage on the servers - and users reported poor Outlook performance with random disconnects.Įvent logs showed many "MapiExceptionRpcServerTooBusy" events (Event ID 4009) - and Mapi logs were filled with "MaxConnectionsExceeded" entries. I usually suggest scaling out simplyīecause its relatively easy and can be done without disrupting current users. Sometimes, this issue (port exhaustion) is because of shared mailboxes and Outlook caching those are shared folders, but that's just one possible reason. You could try that, but MAPI/HTTPS has its own issues of course. So I was quietly hoping that switching from OA to Mapi/Http (or something similar) would alleviate the port issue. Servers are currently "humming along" with roughly 30-40% CPU usage under max load.įrontEnd Access and Mailbox rendering does not appear to bring the servers down. I had, however, NOT given TCP port exhaustion a thought when doing the load tests. We then monitored CPU, Memory and Network load as mailboxes were migrated - and prepared to "scale out" if necessary. So we estimated a configuration of roughly +50% on the "old" Exchange 2010 setup. (Various macro errors, if I remember correctly). To be honest I had issues getting usable results from the Calculator. My first thought is to scale out and add more Exchange Servers. All Client connections load balanced on Netscaler VPX.Dedicated MAPI and Replication NICs (VMXNET3, VMWare Tools 10.2.5).(Currently 2 servers hosts databases, while last server is "backup) ![]() 3 Exchange 2016 Servers, Windows Server 2016 on ESXi 6.5 (14vCPU, 128GB RAM, 18TB SSD). ![]()
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