diff --git a/.github/workflows/Ubuntu.yml b/.github/workflows/Ubuntu.yml
index 28b06541..4540580c 100644
--- a/.github/workflows/Ubuntu.yml
+++ b/.github/workflows/Ubuntu.yml
@@ -30,6 +30,20 @@ jobs:
            CA: "ZeroSSL RSA Domain Secure Site CA"
            CA_EMAIL: "githubtest@acme.sh"
            TEST_PREFERRED_CHAIN: ""
+         - TEST_ACME_Server: "https://localhost:9000/acme/acme/directory"
+           CA_ECDSA: "Smallstep Intermediate CA"
+           CA: "Smallstep Intermediate CA"
+           CA_EMAIL: ""
+           TEST_PREFERRED_CHAIN: ""
+           NO_REVOKE: 1
+         - TEST_ACME_Server: "https://localhost:9000/acme/acme/directory"
+           CA_ECDSA: "Smallstep Intermediate CA"
+           CA: "Smallstep Intermediate CA"
+           CA_EMAIL: ""
+           TEST_PREFERRED_CHAIN: ""
+           NO_REVOKE: 1
+           TEST_IPCERT: 1
+           TestingDomain: "172.17.0.1"
 
     runs-on: ubuntu-latest
     env:
@@ -40,10 +54,25 @@ jobs:
       CA_EMAIL: ${{ matrix.CA_EMAIL }}
       NO_ECC_384: ${{ matrix.NO_ECC_384 }}
       TEST_PREFERRED_CHAIN: ${{ matrix.TEST_PREFERRED_CHAIN }}
+      NO_REVOKE: ${{ matrix.NO_REVOKE }}
+      TEST_IPCERT: ${{ matrix.TEST_IPCERT }}
+      TestingDomain: ${{ matrix.TestingDomain }}
     steps:
     - uses: actions/checkout@v2
     - name: Install tools
       run: sudo apt-get install -y socat
+    - name: Start StepCA
+      if: ${{ matrix.TEST_ACME_Server=='https://localhost:9000/acme/acme/directory' }}
+      run: |
+           docker run --rm -d \
+            -p 9000:9000 \
+            -e "DOCKER_STEPCA_INIT_NAME=Smallstep" \
+            -e "DOCKER_STEPCA_INIT_DNS_NAMES=localhost,$(hostname -f)" \
+            --name stepca \
+            smallstep/step-ca \
+            && sleep 5 && docker exec  stepca step ca provisioner add acme --type ACME \
+            && docker exec  stepca kill -1 1 \
+            && docker exec  stepca cat /home/step/certs/root_ca.crt | sudo bash -c "cat - >>/etc/ssl/certs/ca-certificates.crt"
     - name: Clone acmetest
       run: |
           cd .. \
diff --git a/acme.sh b/acme.sh
index b25619bf..f013fae2 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1272,9 +1272,17 @@ _createcsr() {
   _csr_cn="$(_idn "$domain")"
   _debug2 _csr_cn "$_csr_cn"
   if _contains "$(uname -a)" "MINGW"; then
-    ${ACME_OPENSSL_BIN:-openssl} req -new -sha256 -key "$csrkey" -subj "//CN=$_csr_cn" -config "$csrconf" -out "$csr"
+    if _isIP "$_csr_cn"; then
+      ${ACME_OPENSSL_BIN:-openssl} req -new -sha256 -key "$csrkey" -subj "//O=$PROJECT_NAME" -config "$csrconf" -out "$csr"
+    else
+      ${ACME_OPENSSL_BIN:-openssl} req -new -sha256 -key "$csrkey" -subj "//CN=$_csr_cn" -config "$csrconf" -out "$csr"
+    fi
   else
-    ${ACME_OPENSSL_BIN:-openssl} req -new -sha256 -key "$csrkey" -subj "/CN=$_csr_cn" -config "$csrconf" -out "$csr"
+    if _isIP "$_csr_cn"; then
+      ${ACME_OPENSSL_BIN:-openssl} req -new -sha256 -key "$csrkey" -subj "/O=$PROJECT_NAME" -config "$csrconf" -out "$csr"
+    else
+      ${ACME_OPENSSL_BIN:-openssl} req -new -sha256 -key "$csrkey" -subj "/CN=$_csr_cn" -config "$csrconf" -out "$csr"
+    fi
   fi
 }