In order to carry out essential system maintenance, ASM Online Services will be unavailable between Wednesday, 18 November 2026 at 20:00 GMT and Wednesday, 18 November 2026 at 23:00 GMT. During this time you will be unable to send and receive messages in Sequoia. You will not be able to prepare any CDS declarations and will not be able to view or prepare Safety & Security declarations, ICS2 declarations or Transit phase 5 movements so please retrieve any Transit documents you need prior to the outage.
Do not create any ETSF records on Sequoia during this period.

We will confirm when normal services resume.

We apologise for any inconvenience this may cause.

Planned outage on Tuesday, 17 November 2026 at 04:00 GMT to Tuesday, 17 November 2026 at 07:00 GMT

See message from CCS-UK

Dear CCS-UK User,

 

Please be advised that as a part planned system maintenance, CCS-UK Service requires a scheduled system downtime (impacting all services) on Tuesday 17th November, 2026 starting at 04:00 GMT to 07:00 GMT (up to 3hrs)

 

During this time the connectivity to and from CCS-UK will not be available to you, meaning users will not be able to undertake Import and/or Exports clearances via the CCS-UK system.

 

Please ensure you have resiliency plans in place, or avoid these times especially in the case of perishable goods clearances you are undertaking.

 

CCS-UK apologise for the inconvenience caused and thank you for your patience.

Planned outage on Tuesday, 17 November 2026 at 12:00 GMT to Tuesday, 17 November 2026 at 17:00 GMT

See message from CDS Test Service (TDR)

Good afternoon,

We will be completing a maintenance update to the CDS Trader Dress Rehearsal (TDR) service on Tuesday 17th November 2026.

The outage is expected to last 5 hours, beginning at 12:00 until 17:00. 

During this maintenance window we will be refreshing the below data held in TDR:  

  

• Trader personal, account, and licensing data, using data which will be copied from Production on Tuesday 17th November 2026.

• Refreshing UK/EU Tariff data, using data which has been copied from Production on Wednesday 4th November 2026*

*Trader Dress Rehearsal is a sandbox environment and is regularly refreshed with Trader data and data from the Online Tariff on a given date, as such any CDS changes to Trader data in the live service or updates to the Online Tariff will not be reflected in TDR instantaneously.

There will be a complete outage during this period. Please can you inform your contacts. 

Kind regards, 

TDR Communications Team

Planned outage on Thursday, 19 November 2026 at 14:00 GMT to Thursday, 19 November 2026 at 18:00 GMT

See message from HMRC

HMRC has scheduled a planned system upgrade on Thursday 19th November from 14:00 - 18:00 GMT (4 Hours).

 

During this timeframe, the services normally provided by NCH will be unavailable.

 

This includes (but is not limited to) the following:

 

• ISR/IAR Cancellations

• Licensing Indicator Cancellations

• Override for Inventory Failure

 

Requests submitted during this period may not be processed until the upgrade has been completed and services have been restored.

HMRC apologise for any inconvenience caused during this planned maintenance activity and appreciates your understanding.