We noticed that we couldn't mount any nfs-shares on SLES 15 SP6 servers with nfs client version 2.6.4-150600.26.2.x86_64. The mount attempts were blocked by web access protection as can be seen from corresponding entries in the system log:
servername kernel: [ 76.932560][ T41] eset_wap: cannot obtain process path for pid 41 (error: -61)
after stopping the efs service or adding the nfs server IP to the wap exclusion list nfs shares can be mounted as usual.