Unable to connect to the server. Contact your system administrator with the following error SSL Error 4 The operation completed successfully

Hello,

I am a Citrix novice, so I will certainly fill in any gaps that I can when trying to frame the situation and additional information needed.

I have a few users who are getting the error message "Unable to connect to the server. Contact your system administrator with the following error SSL Error 4 The operation completed successfully" when attempting to log into their environment.

Some information I have retrieved:

We are running: NetScaler VPX (50) - NS10.1: Build 121.10.nc, Date: Oct 18 2013

These are a couple of errors from the logs:

Mon Jan 22 07:09:32 'server_svc_internal_NSSVC_SSL_TCP_192.168.100.6:3008(nsrpcs-127.0.0.1-3008)' DOWN
Mon Jan 22 07:09:32 'server_svc_internal_NSSVC_SSL_192.168.100.6:443(nshttps-127.0.0.1-443)' DOWN
Mon Jan 22 07:11:01 MonServiceBinding_192.168.100.204:80_(tcp-default)(internal): DOWN; Last response: Failure - TCP syn sent, reset received
Mon Jan 22 07:11:02 MonServiceBinding_192.168.100.204:443_(tcp-default)(internal): DOWN; Last response: Failure - TCP syn sent, reset received

This occurs with varying versions of the Citrix Receiver. I was able to replicate the issue with the latest and greatest version.

This is something that just started happening about 18 hours ago.

I am in a position to reboot the Netscaler appliance, but didn't want to do so during a time which we still have a few people working and having someone provide some initial feedback.

Any assistance is greatly appreciated.
LVL 3
djhathAsked:
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Dirk KotteSECommented:
some additional Questions...
your users open the webbrowser (or local installed receiver?) authenticate, see the apps and get the error after clicking the application-icon..?
do you have internal (LAN) and external users?  All get the error? How many get the error?
If yousers do't see the app icons check the StoreFront server is available.
i think there is a firewall between NetScaler and citrix servers ... check connection attempts are not blocked.
is there a kind of endpoint-protection at StoreFront or Ctx-terminal-Servers .. try to disable it temporarily.
djhathAuthor Commented:
Yes, they see the apps and get the error after clicking on the application icon. Everyone is an external user. We have some who aren't getting it, most who are. In my testing, I wasn't able to get logged in with the latest Citrix Receiver version. However, I downgraded to 4.7 and am now just getting a license error from the terminal server on which the Citrix Licensing service is hosted. That, I believe, is a separate issue.
Dirk KotteSECommented:
TS-Licensing errors within citrix environment can create different obscure error messages.
Check netscaler certificate (i use https://www.ssllabs.com/ssltest ). Newer clients may not work with insecure certificates...
SSL-Scanning Firewalls can prevent connections.
Also a update of NetScaler may help:
https://support.citrix.com/article/CTX221453

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Dirk KotteSECommented:
do you need additional help?
problem solved?
Dirk KotteSECommented:
enough hints to solve the problem.
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