The TV presenter and actor, 62, is currently on the road again with his new tour, called The 3rd Farewell.
Brian, who has been travelling the UK this summer with his show, was expected to perform in Bromley on Saturday night (June 15).
But the soap star was left “disappointed” as he told fans it had been cancelled due to “essential venue maintenance” just 24 hours before the show.
Brian shared the update on social media and said: “Right, this is a very important announcement…
“Now some of you may be aware that I’m doing tour.
“It’s very funny,” as he said as he laughed out loud.
He continued: “I’m disappointed because tomorrow I was meant to be in Bromley and due to things totally out of our control, we can’t do it.
“The management there have asked me to read this out.”
He went on: “Due to essential venue maintenance, we are unfortunately having to postpone the show and they are going to move it to the 19th October.”
He explained that the venue would contact all ticketholders about the new date.
Brian concluded his message: “If you haven’t been to see the tour, then hard luck because it’s sold out.
“Anyway, apologies from me and I’ll see you on the 19th.”
It comes after Brian teased a shock return after being banged up.
Rocky’s final scenes aired on December 29 as he confessed all to the police after a tearful goodbye with Kathy.
Rocky’s gambling spiralled out of control and it lead to him burning down wife Kathy’s cafe in the hope of an insurance pay out.
Later on, Rocky started to suspect Kathy was hiding something following her involvement in Keanu Taylor’s death on Christmas Day.
She was encouraged to grass him up to the police by the other women involved in the murder to get him off their case.
Speaking to the Swindon Advertiser, he said: “Playing Rocky was nerve-wracking at first because the show is so iconic and I look back with very fond memories.
“I am in prison so I haven’t died and that’s a nice thought and I could get off with good behaviour.”