An error occurred while trying to communicate with an external SFB user.

Viktar Bachkouski 46 Reputation points
2020-09-05T14:18:23.643+00:00

Hi!

An error occurred while trying to communicate with an external SFB user. I can't always make a call and can't add multiple participants to a conversation. In Event log on Edge Server we're have next error:

The following discovered partners are sending frequent invalid SIP requests to the Access Edge Server.

Traffic from these partners is restricted to 1 message per second as a security measure.

Certificate Subject: "subject 1"; Issuer: "US, DigiCert Inc, www.digicert.com, GeoTrust RSA CA 2018"; Serial Number: 0D59; Common Failures: OTHER(430,OTHER)=1 OTHER(4xx,OTHER)=1

Certificate Subject: "subject 2"; Issuer: "PL, Unizeto Technologies S.A., Certum Certification Authority, Certum Domain Validation CA SHA2"; Serial Number: 5D1B1; Common Failures: SUBSCRIBE(4xx,OTHER)=79

Certificate Subject: "subject 3"; Issuer: "US, Arizona, Scottsdale, "GoDaddy.com, Inc.", http://certs.godaddy.com/repository/, Go Daddy Secure Certificate Authority - G2"; Serial Number: 0097; Common Failures: SUBSCRIBE(4xx,OTHER)=23

Cause: Federated partners that were discovered through DNS SRV are sending frequent SIP requests that cause an error response from the local Skype for Business Server deployment.

Resolution: It is recommended that connections from these partners be blocked at the firewall.

We do not know if the events are related to this error. But they happened about the same time. Any help?

Best Regards,
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Microsoft Office Online Server
Microsoft Office Online Server
Microsoft on-premises server product that runs Office Online. Previously known as Office Web Apps Server.
582 questions
Skype for Business
Skype for Business
A Microsoft communications service that provides communications capabilities across presence, instant messaging, audio/video calling, and an online meeting experience that includes audio, video, and web conferencing.
602 questions
Accepted answer
  1. Sharon Zhao-MSFT 25,051 Reputation points Microsoft Vendor
    2020-09-07T07:18:16.497+00:00

    @Viktar Bachkouski ,

    Do you mean that you can only start peer-to peer IM with external user?

    Does this issue happen on other external users, including different external organizations?

    Please try to add issues partners’ Edge FQDN to the “SIP Federated Domains” using Skype for Business control panel with “Allow” flag.
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    If the response is helpful, please click "Accept Answer" and upvote it.

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