diff --git a/backend/src/db/entity-migrations/v3.3.1-oia-registration.ts b/backend/src/db/entity-migrations/v3.3.1-oia-registration.ts
new file mode 100644
index 0000000000..f7fc154cca
--- /dev/null
+++ b/backend/src/db/entity-migrations/v3.3.1-oia-registration.ts
@@ -0,0 +1,58 @@
+import { Knex } from 'knex';
+import { REGISTRATIONS_TABLE } from '../../repository/registration.repository';
+
+export async function up(knex: Knex): Promise<void> {
+  await updateRegistrationSettings(knex);
+}
+
+async function updateRegistrationSettings(knex: Knex) {
+  await knex.schema.raw(`create table ${REGISTRATIONS_TABLE}_dg_tmp
+                         (
+                           id                         char(36) primary key,
+                           created_at                 datetime default CURRENT_TIMESTAMP not null,
+                           updated_at                 datetime default CURRENT_TIMESTAMP not null,
+                           host                       varchar(255)                       not null,
+                           use_proxy                  boolean  default '0',
+                           proxy_url                  varchar(255),
+                           proxy_username             varchar(255),
+                           proxy_password             varchar(255),
+                           accept_unauthorized        boolean default '0',
+                           activation_code            varchar(255),
+                           check_url                  varchar(255),
+                           activation_date            varchar(255),
+                           activation_expiration_date varchar(255),
+                           token                      varchar(255),
+                           status                     text check (status in ('NOT_REGISTERED', 'PENDING', 'REGISTERED')) not null default 'NOT_REGISTERED'
+);`);
+
+  await knex.schema
+    .raw(`insert into ${REGISTRATIONS_TABLE}_dg_tmp(id, created_at, updated_at, host, use_proxy, proxy_url, proxy_username, proxy_password,
+                                                          accept_unauthorized, activation_code, check_url, activation_date,
+                                                          activation_expiration_date, token, status)
+                         select id,
+                                created_at,
+                                updated_at,
+                                host,
+                                use_proxy,
+                                proxy_url,
+                                proxy_username,
+                                proxy_password,
+                                accept_unauthorized,
+                                activation_code,
+                                check_url,
+                                activation_date,
+                                activation_expiration_date,
+                                token,
+                                status
+                         from ${REGISTRATIONS_TABLE};`);
+
+  await knex.schema.raw(`drop table ${REGISTRATIONS_TABLE};`);
+
+  await knex.schema.raw(`alter table ${REGISTRATIONS_TABLE}_dg_tmp rename to ${REGISTRATIONS_TABLE};`);
+
+  await knex.schema.alterTable(REGISTRATIONS_TABLE, table => {
+    table.unique(['activation_code', 'check_url', 'host']);
+  });
+}
+
+export async function down(_knex: Knex): Promise<void> {}
diff --git a/backend/src/service/oia/registration.service.spec.ts b/backend/src/service/oia/registration.service.spec.ts
index dd5ef932c9..7dc0518b6d 100644
--- a/backend/src/service/oia/registration.service.spec.ts
+++ b/backend/src/service/oia/registration.service.spec.ts
@@ -114,7 +114,7 @@ describe('Registration service', () => {
     (generateRandomId as jest.Mock).mockReturnValue('1234');
 
     const command: RegistrationSettingsCommandDTO = {
-      host: 'http://localhost:4200',
+      host: 'http://localhost:4200/',
       acceptUnauthorized: false,
       useProxy: true,
       proxyUrl: 'http://localhost:3128',
diff --git a/backend/src/service/oia/registration.service.ts b/backend/src/service/oia/registration.service.ts
index 7bb2ece0ce..b11ef3d963 100644
--- a/backend/src/service/oia/registration.service.ts
+++ b/backend/src/service/oia/registration.service.ts
@@ -66,6 +66,9 @@ export default class RegistrationService {
     };
     let response;
     try {
+      if (command.host.endsWith('/')) {
+        command.host = command.host.slice(0, command.host.length - 1);
+      }
       const url = `${command.host}/api/oianalytics/oibus/registration`;
       const agent = createProxyAgent(
         command.useProxy,