diff --git a/src/modules/resource/components/create-resource/resource-type/GitLab.vue b/src/modules/resource/components/create-resource/resource-type/GitLab.vue
index a50038c473084e24f7b04060a1ecc9278d07bce6..26d59bbbfb1f770a649f798caf4ad35d75efc3ae 100644
--- a/src/modules/resource/components/create-resource/resource-type/GitLab.vue
+++ b/src/modules/resource/components/create-resource/resource-type/GitLab.vue
@@ -174,9 +174,13 @@ import type {
 import type { GitlabInformation } from "@/modules/resource/types";
 
 import { useVuelidate, type ValidationArgs } from "@vuelidate/core";
-import { required, url } from "@vuelidate/validators";
+import { and, helpers, required, url } from "@vuelidate/validators";
 import { isNumber } from "lodash";
 
+const isHttpsUrl = (value: string) =>
+  !helpers.req(value) || value.startsWith("https://");
+const isValidGitLabUrl = and(url, isHttpsUrl);
+
 export default defineComponent({
   props: {
     value: {
@@ -218,7 +222,7 @@ export default defineComponent({
   validations() {
     return {
       gitlabInformation: {
-        domain: { required, url },
+        domain: { required, isValidGitLabUrl },
         accessToken: { required },
         project: { required },
         reference: { required },
diff --git a/src/modules/resource/i18n/de.ts b/src/modules/resource/i18n/de.ts
index 686792cc8542bbf23d34f3cc479a35531a43fc90..3b96657028a851f0068982be98702432b749ff3c 100644
--- a/src/modules/resource/i18n/de.ts
+++ b/src/modules/resource/i18n/de.ts
@@ -288,14 +288,14 @@ export default {
       domain: "GitLab Domain",
       domainLabel: "Domain:",
       domainInvalidTooltip:
-        "Die angegebene Domain ist keine gültige vollständige URL",
+        "Die angegebene Domain ist keine gültige vollständige URL. Bitte beachten, dass nur das HTTPS-Protokoll zugelassen ist.",
 
       accessToken: "Projekt- oder Gruppenzugangstoken",
       accessTokenLabel: "@:(resourceType.gitlab.accessToken):",
       accessTokenInvalidTooltip: "Dieses Feld ist erforderlich",
       accessTokenInfoPopover:
         "Wie erstellt man ein @:(resourceType.gitlab.accessToken)?",
-      accessTokenInfoPopoverUrl: "https://",
+      accessTokenInfoPopoverUrl: "https://", // TODO: add the URL for the Access Token creation guide
 
       projectId: "GitLab Projekt Id",
       projectIdLabel: "GitLab Projekt Id:",
diff --git a/src/modules/resource/i18n/en.ts b/src/modules/resource/i18n/en.ts
index df0cae42d36c04d26a7182d50c39717e4ac0c247..daad9bfc9b23112d7ad55d9f580ba2288d99a27d 100644
--- a/src/modules/resource/i18n/en.ts
+++ b/src/modules/resource/i18n/en.ts
@@ -283,14 +283,15 @@ export default {
     gitlab: {
       domain: "GitLab Domain",
       domainLabel: "Domain:",
-      domainInvalidTooltip: "The provided domain is not a valid full URL",
+      domainInvalidTooltip:
+        "The provided domain is not a valid full URL. Note that only the HTTPS protocol is allowed.",
 
       accessToken: "Project or Group Access Token",
       accessTokenLabel: "@:(resourceType.gitlab.accessToken):",
       accessTokenInvalidTooltip: "This is a required field",
       accessTokenInfoPopover:
         "How to create a @:(resourceType.gitlab.accessToken)?",
-      accessTokenInfoPopoverUrl: "https://",
+      accessTokenInfoPopoverUrl: "https://", // TODO: add the URL for the Access Token creation guide
 
       projectId: "GitLab Project Id",
       projectIdLabel: "GitLab Project Id:",