Today I looked into a Netscaler VPX Gateway with network issues.
Response was slow and users reported this error when connecting to Citrix backend servers:
“Failed with status 1110″ When Launching Desktops or Apps Through NetScaler Gateway”
I checked the eventlog on the vpx with: shell nsconmsg -K /var/nslog/newnslog -d event and found a log full of these errors:
2546 245 PPE-0 MonServiceBinding_srv-xdc01.office.local:80_(sta)(vpndbssvc_-1250801384): UP; Last response: Success – Probe to STA server succeeded. Tue Oct 25 06:53:13 2016
2547 484 PPE-0 MonServiceBinding_srv-xdc01.office.local:80_(sta)(vpndbssvc_-1250801384): DOWN; Last response: Failure – TCP connection successful, but application timed out Tue Oct 25 07:01:19 2016
After looking around in the Systems menu I disabled Mac Based Forwarding and enabled TCP Window Scaling as per CTX121149.
The network issued were gone and no more application time-out failures in the eventlog…
More about Mac Based Forwarding here.