For future reference, when it comes to urgent issues like this it is best if you contact us via email at Suppor. I am sending a call to the Cloud team right now to have them reach out. If you're supporting a secure gateway / access gateway solution for external clients / home working, you'll. Good morning Dea ( ), I have tested with the Support user for your practice and been able to reproduce the issue. The reason why this may appear just now more frequently is that SHA-1 are not very secure so logically servers migrate to new SHA-2 certificates, which have poor support in slightly older ICA clients and this produces this misleading error. common causes for 'There is no Citrix SSL server configured on the specified address.'. It might not solve all the occurrences of this error, but at least some of them. I found out that newer version of icaclient (13.3) supports SHA-2 keys, so upgrading of icaclient solved the problem. The message is unfortunately very misleading, it is probably re-used for multiple different situations. Then I found out that the problem in my case was that my icaclient did not support SHA256 certificates (it did not support any SHA-2 certificates).
Google advised a lot of things that did not help, the same error message still persisted. I have installed them correctly into /opt/Citrix/ICAClient/keystore/cacerts, then I did the rehash with "c_rehash /opt/Citrix/ICAClient/keystore/cacerts", I have also updated directories /etc/ssl/certs/ and /usr/share/ca-certificates/mozilla/ and run update-ca-certificates. Like javy666, regardless what I did with certificates, I was still getting this error. I had similar problem (with icaclient 13.0) under Ubuntu 14.04 LTS.
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