diff --git a/docs/troubleshoot/troubleshoot-zos-certificate.md b/docs/troubleshoot/troubleshoot-zos-certificate.md
new file mode 100644
index 0000000000..13a9d79b23
--- /dev/null
+++ b/docs/troubleshoot/troubleshoot-zos-certificate.md
@@ -0,0 +1,53 @@
+# Troubleshooting the certificate configuration
+
+The following topic provides the information that can help you troubleshoot problems when you encounter errors or warnings in configuring certificates.
+
+## Configuring a certificate that uses an external certificate authority (CA)
+
+**Symptom**
+
+When you configure the Zowe certificate with an external certificate that is signed by an external CA, you might encounter the following error.
+
+```
+_ZWED:16843383 ZWESVUSR WARN (zsf.apiml,apiml.js:195) Error: write EPROTO 1976209423206449153:error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown:../deps/openssl/openssl/ssl/record/rec_layer_s3.c:1544:SSL alert number 46
+at WriteWrap.onWriteComplete Ýas oncomplete¨ (internal/stream_base_commons.js:87:16) {
+errno: 'EPROTO',
+code: 'EPROTO',
+syscall: 'write'
+```
+
+
+**Solution**
+
+This error is caused because the external certificate is not imported into the truststore.
+
+You can follow these steps to resolve the issue.
+
+1. Download the external certificate when your browser is pointed to the Zowe virtual Desktop.
+
+2. Save this certificate in a `USS` file. For example, the file is named as `public.cer-ebcdic` here.
+
+3. Run the following command in the `<Keystore_Directory>` to import this certificate into the Zowe truststore, `localhost.truststore.p12`.
+
+```
+keytool -import -alias public1 -file public.cer-ebcdic -storetype PKCS12 -storepass xxxxxx -keystore localhost.truststore.p12
+```
+
+**Note**
+
+The configuration is a part in `zowe-setup-certificates.env` file. You must make sure that `EXTERNAL_CERTIFICATE_ALIAS` is not blank.
+
+```shell
+EXTERNAL_CERTIFICATE=/path/to/keystore.p12
+# It should be PKCS12 (.p12) file.
+EXTERNAL_CERTIFICATE_ALIAS=servercert
+# It should be in the .p12 file.
+KEYSTORE_PASSWORD=mypass
+# It should be the password of .p12 file.
+EXTERNAL_CERTIFICATE_AUTHORITIES="/path/to/cacert_1.cer /path/to/cacert_2.cer"
+# It should be the public certificates of trusted CAs, base64 (.pem or .cer).
+ZOSMF_CERTIFICATE= 
+# It should be base64 (.pem or .cer).
+```
+
+4. Restart Zowe and check whether the error is resolved.
diff --git a/sidebars.js b/sidebars.js
index 483111af83..26580703cf 100644
--- a/sidebars.js
+++ b/sidebars.js
@@ -326,6 +326,7 @@ module.exports = {
       ],
     },
     "troubleshoot/troubleshoot-zos",
+    "troubleshoot/troubleshoot-zos-certificate",
     "troubleshoot/k8s-troubleshoot",
     {
       type: "category",