Certificate error when using Citrix Receiver

Question

I am getting this error when attempting to load a Desktop module up within Citrix Receiver:

What I don't understand is I can see this particular certificate is set to "Trust.." under any/all circumstances that I can find. This only happens in Ubuntu, and I did not installed any certificates (manually) on either partition when trying to correct the issue. The browser also appears to be irrelevant (Chrome/Firefox both generate the same error). Forgive my ignorance on certificates, but this seems to be beyond my expertise.

There are a few places I've looked through various search engines, and I found other users who have had similar issues with certificates in the Linux Citrix Receiver, but I'm not sure what's wrong with this certificate, as none of the other suggestions I've tried have worked so far, and they're too numerous to go into detail... so I'd like to take it from here and see what you all can offer up.

Solution 1

To prevent the SSL error 61 when accessing remote sessions:

Make Firefox's certificates accessible to Citrix,

sudo ln -s /usr/share/ca-certificates/mozilla/* /opt/Citrix/ICAClient/keystore/cacerts
sudo /opt/Citrix/ICAClient/util/ctx_rehash

^{Source: Citrix help page}

Solution 2

Newer versions of the receiver require you to convert the CRT file to PEM, place the crt in a specific directory, and run a citrix utility.

If your installation is in /opt/Citrix/ICAClient and assuming the signing root certificate or CA is an existing one in ca-certificates:

1. Get to the certificates directory:

cd /usr/share/ca-certificates/mozilla/

2. Convert the desired CRT to PEM :

sudo openssl x509 -outform pem -in [SIGNING_CERTIFICATE_YOU_ID_FROM_COMPANY_WEBSITE.crt] -out [NEW_CERT_PICK_YOUR_NAME.pem]

3. Link it to the Citrix directory and rehash:

sudo ln -s NEW_CERT /opt/Citrix/ICAClient/keystore/cacerts/
cd /opt/Citrix/ICAClient/util
sudo ./ctx_rehash

If the CA is not a known and trusted one present in the /usr/share/ca-certificates/mozilla directory mentioned above:

1. Download it using your browser's security info on the site

2. Convert it to PEM Move it, and rehash: Step 3 above.

Left the crossed out text for anyone needing those instructions for whatever reason but I recently tested just moving the CRT to the directory and the rehash utility will convert as needed.

Solution 3

some users (like me) might find that even after linking Firefox to the cacerts folder the error persists.

That appears to be because Citrix does not supply all of the latest certificates.

The solution appears to be to note the certificate said to be "not trusted" (eg "Verisign Class 3 Public Primary Certification Authority - G5") then export it from Firefox (under the Preferences menu then Certificates) to */ICAClient/keystore/cacerts.

Worked for me. Hope this helps.

Comments

[gravity]

Worked like a charm. Don't know how I missed this on Citrix's own site, I guess I was looking too much at user-centric help/forums.

[LRE]

so close yet so far! No joy for me I'm afraid

[blvdeer]

Works on Linux Mint 18 based on Ubuntu 16.04

[RuntimeException]

I did a copy instead of symbolic link. Works good. I copied only the certificate it complained about --> sudo cp /etc/ssl/certs/DigiCert_High_Assurance_EV_Root_CA.pem /opt/Citrix/ICAClient/keystore/cacerts/ --- Using Citrix Receiver Full 13.6 on Ubuntu 16.04.3

[kidmose]

The sudo /opt/Citrix/ICAClient/util/ctx_rehash bit did it for me (Skipped the conversion withsudo openssl ..., though my export appears to be a pem)

[kidmose]

Note @marlon 's comment: After copying/linking you must run sudo /opt/Citrix/ICAClient/util/ctx_rehash

[Marlon]

if the certificate is in PEM this works, if not look at my answer.

[Thomas]

For me, the pem trick worked once (thanks). But not after the reboot. I tried again the same steps, no more luck. I reverted to icaclient 13.4 and it just works. Looks like verions >13.4 are broken.

[Marlon]

Not broken but rather they changed they way they worked to be more secure. If that didn't work the second time then something else is the cause? I use the client daily and it works just fine. As long as your company wont require a specific version higher than 13.4 you can keep it.

[Rocologo]

Works on Linux Mint 19 (Ubuntu 18.04) (I had to both link the files and run ctx_rehash) and then it worked perfectly

[Andreas J]

Still relevant and working for Ubuntu 19.10

[Muposat]

This fixed "0.0.0.2 No such file or directory" error for me. Ubuntu 20.04

[Merlijn Sebrechts]

You might need to run sudo /opt/Citrix/ICAClient/util/ctx_rehash for the latest version of the workspace app.