Getting 401 error in response, using Codebird for php


I have been using codebird- php for couple weeks and it was working fine until last week. I am now getting 401 error and it seems my server ip is blocked. As the same code works locally and on other servers.
I have recreated my app credentials, created new app and checked server time. Nothing works.

What could be wrong in this case? I understand multiple connections could be a problem but then should I keep connection open without any time limit?

Any help is most appreciated.